1
00:00:02,802 --> 00:00:04,703
[indistinct police
radio chatter]
2
00:00:04,705 --> 00:00:07,106
[man 1] The injuries were
very catastrophic.
3
00:00:07,108 --> 00:00:10,409
It was one of the more violent
beatings that I think I've ever seen.
4
00:00:10,677 --> 00:00:12,277
[gunshot]
5
00:00:12,279 --> 00:00:14,346
[man 1] He was in the
wrong place at the wrong time.
6
00:00:20,854 --> 00:00:25,257
They had no enemies
whatsoever, so why did this happen?
7
00:00:29,929 --> 00:00:34,400
[woman 1] Would a daughter commit
murder in order to achieve financial gain?
8
00:00:35,769 --> 00:00:38,504
[man 1] He admitted that they
had not always been close.
9
00:00:39,639 --> 00:00:42,875
[man 2] Just the need
to survive the addiction
10
00:00:42,877 --> 00:00:45,544
can motivate
extremely dangerous behavior,
11
00:00:46,212 --> 00:00:47,513
including murder.
12
00:00:49,916 --> 00:00:52,184
[man 1] You hold out the hope
that it's gonna be the,
13
00:00:52,186 --> 00:00:54,353
the quote-unquote "smoking gun
of the case."
14
00:00:54,821 --> 00:00:56,188
[gunshot]
15
00:00:57,057 --> 00:00:58,590
[narrator] Everyday
in North America
16
00:00:58,592 --> 00:01:01,427
dozens of people are murdered.
17
00:01:01,429 --> 00:01:03,762
The key to solving the
toughest of these homicides
18
00:01:03,764 --> 00:01:07,866
lies in the final 24 hours
of the victim's life.
19
00:01:07,868 --> 00:01:13,305
To crack the case detectives
must reconstruct that critical timeline.
20
00:01:13,307 --> 00:01:16,141
The minutes and hours
containing evidence
21
00:01:16,143 --> 00:01:18,143
that can help unlock the mystery
22
00:01:18,145 --> 00:01:19,645
and catch the killer.
23
00:01:30,090 --> 00:01:32,191
[narrator]
Springfield, Missouri,
24
00:01:32,193 --> 00:01:36,895
a city where residents are know for
enjoying the simple pleasures of life,
25
00:01:36,897 --> 00:01:41,567
from small-town hospitality
to the great outdoors.
26
00:01:42,902 --> 00:01:46,305
[Neal] Springfield is
in the heart of the Ozarks
27
00:01:47,173 --> 00:01:50,576
We are surrounded
by lakes and forest,
28
00:01:50,578 --> 00:01:51,810
so it's very good
if you're into outdoors.
29
00:01:51,812 --> 00:01:54,012
It's good, good area for that.
30
00:01:54,014 --> 00:01:58,083
[Jessica Tyrrell] It's kind of a
bigger city with a small town feel.
31
00:01:59,519 --> 00:02:01,320
If you move into
a new neighborhood
32
00:02:01,322 --> 00:02:05,657
people will bring cookies and
brownies and breads, things like that.
33
00:02:05,659 --> 00:02:08,193
It's a very warm
and inviting place.
34
00:02:08,928 --> 00:02:12,197
[narrator] But as the sun
rises on another beautiful day
35
00:02:12,199 --> 00:02:15,434
it appears two Springfield
residents have gone missing.
36
00:02:16,970 --> 00:02:18,137
[cell phone ringing]
37
00:02:18,139 --> 00:02:21,373
On my way to work
I tried to call my mom
38
00:02:21,375 --> 00:02:23,175
and I did not reach her.
39
00:02:23,177 --> 00:02:25,777
[cell phone ringing]
40
00:02:25,779 --> 00:02:28,013
I thought maybe
she was in the garden
41
00:02:28,781 --> 00:02:31,116
so I tried again
a little bit later
42
00:02:31,751 --> 00:02:34,019
and I still did not reach her.
43
00:02:34,021 --> 00:02:37,156
My parents had
a very strict routine
44
00:02:37,158 --> 00:02:40,425
and I just felt like
something wasn't right.
45
00:02:41,761 --> 00:02:43,328
[narrator]
Her concern mounting,
46
00:02:44,097 --> 00:02:46,165
Jessica and her fiancé Jason
47
00:02:46,167 --> 00:02:48,867
rush from their home
in Oklahoma city
48
00:02:48,869 --> 00:02:50,969
to her parents' house
in Springfield
49
00:02:50,971 --> 00:02:52,271
five hours away.
50
00:02:53,039 --> 00:02:55,941
We did that drive
in about four hours that day.
51
00:02:55,943 --> 00:02:59,011
Um, arriving at the house
approximately seven o'clock.
52
00:03:02,649 --> 00:03:04,516
[Jessica] I hit
that garage door button
53
00:03:08,388 --> 00:03:10,589
and both of their cars
were in the garage.
54
00:03:13,059 --> 00:03:17,829
I think my stomach
just completely fell.
55
00:03:17,831 --> 00:03:19,097
I knew something was very wrong
56
00:03:19,099 --> 00:03:21,366
at that point in time.
57
00:03:21,368 --> 00:03:25,237
[narrator] Soon after arriving
Jessica is calling 911.
58
00:03:25,239 --> 00:03:26,638
[cell phone ringing]
59
00:03:26,640 --> 00:03:28,240
[siren wailing]
60
00:03:28,975 --> 00:03:31,043
[indistinct police
radio chatter]
61
00:03:31,045 --> 00:03:34,446
[Neal] When officers arrive,
they go in and check the home.
62
00:03:36,950 --> 00:03:39,985
And upon entering the home,
immediately discovered
63
00:03:39,987 --> 00:03:43,055
a male body upstairs
in a hallway
64
00:03:44,190 --> 00:03:46,091
They continued
to search the residence
65
00:03:46,093 --> 00:03:48,994
and in the basement of
the home, in the office area
66
00:03:49,662 --> 00:03:52,297
they also discovered
another body.
67
00:03:55,902 --> 00:03:59,771
[narrator] The victims are identified
as husband and wife of 30 year,
68
00:03:59,773 --> 00:04:01,406
Gary and Jan Tyrrell.
69
00:04:04,143 --> 00:04:06,111
[Jessica] My dad was
a lifelong educator.
70
00:04:06,412 --> 00:04:09,214
Um, he...
71
00:04:10,049 --> 00:04:12,251
um, taught school.
72
00:04:12,919 --> 00:04:15,254
He was a big teddy bear
of a man.
73
00:04:15,256 --> 00:04:19,725
He loved helping children,
helping others
74
00:04:19,727 --> 00:04:22,127
and my mom did as well.
75
00:04:22,129 --> 00:04:24,630
Um, [sighs] they both
were huge givers.
76
00:04:25,231 --> 00:04:29,334
My mom also had a big heart.
77
00:04:29,336 --> 00:04:32,004
She loved to sew and crafts.
78
00:04:33,106 --> 00:04:36,642
She knit little hats
to make sure that
79
00:04:36,644 --> 00:04:39,144
the cancer patients
didn't get cold.
80
00:04:40,980 --> 00:04:44,383
My parents were both
very loving and kind people.
81
00:04:47,120 --> 00:04:48,553
[narrator] Tasked
with investigating
82
00:04:48,555 --> 00:04:52,224
the brutal double homicide
of Gary and Jan Tyrrell
83
00:04:52,226 --> 00:04:56,128
is detective Neal McAmis of
the Springfield Police Department.
84
00:04:58,998 --> 00:05:00,832
[Neal] Gary had a lot of blood
85
00:05:00,834 --> 00:05:03,201
about his head and shoulder area
86
00:05:03,670 --> 00:05:06,104
with multiple gunshot wounds.
87
00:05:07,807 --> 00:05:11,209
But there was nothing immediately
within the areas of the body
88
00:05:11,211 --> 00:05:14,012
that would indicate that the
murder weapon was left on scene.
89
00:05:18,251 --> 00:05:24,222
We also noticed there were some kind of
weird flakes of some kind on the ground.
90
00:05:27,827 --> 00:05:30,062
We didn't know what
they were at that point.
91
00:05:32,765 --> 00:05:35,434
[Neal] With
the position of Gary's body,
92
00:05:35,436 --> 00:05:38,036
it was almost as if he was
in a struggle with the suspect
93
00:05:38,038 --> 00:05:39,004
trying to get away.
94
00:05:39,006 --> 00:05:41,039
As if the suspect
was grasping at him
95
00:05:41,041 --> 00:05:43,375
and pulling at him to try
to get him to come back
96
00:05:50,216 --> 00:05:53,018
Jan had a very traumatic injury
97
00:05:53,020 --> 00:05:54,553
to the back of her head.
98
00:05:56,322 --> 00:05:58,990
And in my career was one
of the more violent beatings
99
00:05:58,992 --> 00:06:01,093
that I think I'd ever seen.
100
00:06:01,794 --> 00:06:03,962
We did not know at that point
101
00:06:03,964 --> 00:06:05,630
what the cause
of that injury was.
102
00:06:08,034 --> 00:06:09,968
But we did notice immediately
103
00:06:09,970 --> 00:06:14,473
there were some of the same
white flakes around her body as well
104
00:06:15,775 --> 00:06:18,510
Jan's murder was
really vicious, very violent.
105
00:06:21,247 --> 00:06:24,216
Almost as if it was
a rage type killing.
106
00:06:25,718 --> 00:06:30,088
Gary having, what we believe,
interrupted the crime.
107
00:06:32,158 --> 00:06:34,126
He was in the wrong place
at the wrong time.
108
00:06:34,160 --> 00:06:35,627
[gunshot]
109
00:06:41,968 --> 00:06:45,036
[Neal] In the middle of the
living area of the basement
110
00:06:45,038 --> 00:06:46,371
was a latex glove.
111
00:06:47,440 --> 00:06:50,275
The Tyrrell home
was extremely clean,
112
00:06:50,277 --> 00:06:52,277
very well kept and organized.
113
00:06:52,279 --> 00:06:55,614
So this latex glove was
just totally out of place.
114
00:06:57,950 --> 00:06:59,951
But of course you hold out
the hope that it's gonna be
115
00:06:59,953 --> 00:07:03,121
the quote-unquote "smoking gun
of the case."
116
00:07:03,123 --> 00:07:06,291
And that gave us some hope that
we'd be able to find DNA on the glove
117
00:07:06,293 --> 00:07:08,427
that could link us
to the killer.
118
00:07:10,062 --> 00:07:12,898
But we really don't know
if this was a planned event
119
00:07:12,900 --> 00:07:15,367
or if this was
a crime of passion
120
00:07:15,369 --> 00:07:17,636
and we don't know
if there's one killer,
121
00:07:17,638 --> 00:07:19,404
if we're dealing
with multiple people.
122
00:07:19,406 --> 00:07:22,340
We're still trying to piece
puzzle pieces together
123
00:07:22,342 --> 00:07:24,910
to figure out
what we have going on.
124
00:07:24,912 --> 00:07:28,380
[narrator] To solve the double
homicide of Gary and Jan Tyrrell
125
00:07:28,382 --> 00:07:30,849
Detective McAmis
will need to reconstruct
126
00:07:30,851 --> 00:07:33,518
the final 24 hours
of their lives.
127
00:07:35,555 --> 00:07:38,089
[Neal] At this point,
we theorize the time of death.
128
00:07:38,091 --> 00:07:41,226
It had been at least a while
because the blood had dried
129
00:07:41,228 --> 00:07:43,295
under both Gary and Jan.
130
00:07:43,297 --> 00:07:45,197
The blood was dried on scene.
131
00:07:46,933 --> 00:07:48,934
[Neal] We believe
the murders occurred
132
00:07:48,936 --> 00:07:53,638
sometime between
7:00 p.m. and 7:30 p.m.
133
00:07:54,340 --> 00:07:56,808
on the night of April 30th
134
00:07:56,810 --> 00:08:00,011
[Michael] The wounds inflicted
on the victims in this case
135
00:08:00,013 --> 00:08:05,617
tells me that this is not a well-executed
or carefully executed crime.
136
00:08:05,619 --> 00:08:08,653
There is some kind of message
being sent
137
00:08:08,655 --> 00:08:11,790
and, uh, that could be
something internally expressive
138
00:08:11,792 --> 00:08:12,958
that only the killer would know
139
00:08:12,960 --> 00:08:15,760
but the brutality
and the over kill
140
00:08:15,762 --> 00:08:19,231
suggests that there was
something very personal about this.
141
00:08:22,301 --> 00:08:24,169
[Neal] We're
still looking for motive.
142
00:08:24,171 --> 00:08:26,738
Gary and Jan are
a very beloved couple.
143
00:08:26,740 --> 00:08:29,407
So, why did this happen?
Why-- What was going on?
144
00:08:30,643 --> 00:08:33,979
[narrator] With more evidence
required to solidify a theory
145
00:08:33,981 --> 00:08:36,715
Detective McAmis continues
to search the house
146
00:08:36,717 --> 00:08:38,984
looking for clues
to catch the killer.
147
00:08:40,186 --> 00:08:44,589
[Neal] There was a large safe
for Gary to keep his valuables.
148
00:08:46,325 --> 00:08:48,994
It was really odd because
there were pry marks on it.
149
00:08:51,030 --> 00:08:53,131
[Neal] Throughout
the Tyrrell home, there's just
150
00:08:53,133 --> 00:08:56,368
numerous valuables
and collectibles of all kinds
151
00:08:56,370 --> 00:09:00,171
from gold, jewelry, silver...
152
00:09:00,173 --> 00:09:02,941
It was obvious to us that the
Tyrrells were worth a lot of money
153
00:09:02,943 --> 00:09:06,378
in terms of the collectibles and
valuables that they had inside the home.
154
00:09:11,183 --> 00:09:15,153
[Neal] We found a ledger or
kind of an itemized list of coins,
155
00:09:15,155 --> 00:09:17,622
uh, that he was keeping track of
156
00:09:17,624 --> 00:09:21,226
that were worth $22,000 total.
157
00:09:21,994 --> 00:09:25,897
Gary was also
a collector of guns.
158
00:09:25,899 --> 00:09:30,969
Maybe the suspect grabbed one of
Gary's guns and killed Gary with it.
159
00:09:30,971 --> 00:09:33,672
Is robbery going to be
our motive here?
160
00:09:33,674 --> 00:09:39,144
Does the killer know the valuables
and how much these items are worth?
161
00:09:39,146 --> 00:09:42,080
[narrator] But even
with a possible robbery motive
162
00:09:42,082 --> 00:09:44,616
detectives find themselves
with little evidence
163
00:09:44,618 --> 00:09:46,985
that could point
toward their killer.
164
00:09:46,987 --> 00:09:49,487
[Neal] There's
no type of forced entry,
165
00:09:49,489 --> 00:09:51,590
there's no ransacking
of the home
166
00:09:51,592 --> 00:09:56,695
and we have no idea if anything
is missing at all at this point.
167
00:09:56,697 --> 00:10:01,967
The killer has to be someone that
either, one, has access to the home
168
00:10:01,969 --> 00:10:07,038
or two, it's somebody that Jan
would've let inside the home.
169
00:10:07,040 --> 00:10:10,075
[narrator] Detectives turn
their focus to the one person
170
00:10:10,077 --> 00:10:12,277
they know who could get inside,
171
00:10:12,279 --> 00:10:15,080
the Tyrrells' only child,
Jessica.
172
00:10:17,216 --> 00:10:18,483
[Michael] In any circumstance
173
00:10:18,485 --> 00:10:20,185
where you have
a wealthy older couple
174
00:10:20,187 --> 00:10:24,222
who are murdered together,
you naturally have to ask
175
00:10:24,224 --> 00:10:26,524
who would stand to benefit
from this tragedy?
176
00:10:27,827 --> 00:10:31,029
And police didn't have
to look too far in this case
177
00:10:31,031 --> 00:10:34,499
to see that their daughter
stood to inherit everything.
178
00:10:42,975 --> 00:10:46,645
[narrator] In the horrific double
homicide of Gary and Jan Tyrrell,
179
00:10:46,647 --> 00:10:50,115
Detective McAmis has
identified a person of interest.
180
00:10:51,651 --> 00:10:54,019
The couple's daughter, Jessica.
181
00:10:58,791 --> 00:11:00,558
[Jessica] The person who had
the most to gain was me.
182
00:11:01,394 --> 00:11:05,230
And because
I stood to inherit everything.
183
00:11:21,614 --> 00:11:26,885
Jessica said she last spoke with
her mother at 3:20 p.m. on April 30th.
184
00:11:26,887 --> 00:11:30,021
After speaking with her mother
she had a doctor's appointment
185
00:11:30,023 --> 00:11:34,325
and was at the doctor's
appointment until about 5:00 p.m.
186
00:11:34,327 --> 00:11:36,061
[Neal] After
her doctor's appointment,
187
00:11:36,063 --> 00:11:38,930
she and Jason went to
a Pizza Hut in Oklahoma city.
188
00:11:38,932 --> 00:11:43,702
They arrived around 6:00
p.m. and ate dinner there.
189
00:11:43,704 --> 00:11:47,272
And they arrived home
at approximately 7:00 p.m.
190
00:11:50,109 --> 00:11:53,845
Jessica said that Gary was
supposed to teach a class that night,
191
00:11:53,847 --> 00:11:57,182
from 5:30 p.m. until 9:00 p.m.
192
00:11:59,351 --> 00:12:00,885
And then she would commonly
193
00:12:00,887 --> 00:12:05,290
received a text message from
her father wishing her, "Good night."
194
00:12:05,292 --> 00:12:10,528
But she did not received a text message from
her father on the evening of April 30th.
195
00:12:11,263 --> 00:12:12,097
[cell phone ringing]
196
00:12:12,099 --> 00:12:14,099
On the morning of May 1st,
197
00:12:14,101 --> 00:12:18,369
Jessica tried calling her mother
at approximately 7:30 a.m.
198
00:12:18,371 --> 00:12:20,371
[cell phone ringing]
199
00:12:23,242 --> 00:12:25,043
Her mother did not answer.
200
00:12:31,083 --> 00:12:34,686
[Neal] She's so concerned about not
being able to speak with her parents,
201
00:12:34,688 --> 00:12:38,523
that she wanted to come check on
her parents to see what was going on.
202
00:12:43,763 --> 00:12:47,665
It was odd as to why just can't
Jason did not go into the residence,
203
00:12:49,235 --> 00:12:51,269
was something more nefarious
going on here
204
00:12:51,271 --> 00:12:54,873
that Jessica and Jason
possibly knew that the bodies
205
00:12:54,875 --> 00:12:56,007
were gonna be in the home,
206
00:12:56,009 --> 00:12:58,343
that they had some
kind of involvement.
207
00:13:01,647 --> 00:13:03,948
[narrator] Detective McAmis
shifts his focus
208
00:13:03,950 --> 00:13:07,051
to confront Jessica about
a possible financial motive
209
00:13:07,053 --> 00:13:08,987
for her parents' murder.
210
00:13:10,222 --> 00:13:14,859
[Neal] She's the sole benefactor
and would stand to gain
211
00:13:14,861 --> 00:13:18,029
a large amount of money by
the passing of her parents.
212
00:13:20,900 --> 00:13:23,568
Jessica said that she didn't
need her parents' money,
213
00:13:23,570 --> 00:13:26,604
because if she wanted it that her
parents would assist her and help her out,
214
00:13:26,606 --> 00:13:30,341
so she denied any type of
financial motive in terms of, uh,
215
00:13:30,343 --> 00:13:31,976
wanting her parents dead.
216
00:13:31,978 --> 00:13:33,545
[telephone ringing]
217
00:13:33,547 --> 00:13:36,247
[narrator] With Jessica's
motive under the microscope,
218
00:13:36,249 --> 00:13:41,152
Detective McAmis moves on to
interview her fiancé, Jason Murray.
219
00:13:41,987 --> 00:13:44,656
[Jason] When I realized
that we were both suspects.
220
00:13:44,658 --> 00:13:49,027
It was upsetting and it was
also somewhat frightening.
221
00:13:50,196 --> 00:13:54,032
[Neal] Jason tells us that he went
to work the morning of April 30th,
222
00:13:54,034 --> 00:13:57,202
where he said he stayed until
about 5:00 p.m.
223
00:13:58,204 --> 00:14:02,740
[Jason] We went to a Pizza Hut
and had dinner.
224
00:14:02,742 --> 00:14:04,709
[Neal] And then returned
home around 7:00 p.m.
225
00:14:04,711 --> 00:14:08,179
which was in line with,
with what Jessica had said.
226
00:14:10,416 --> 00:14:14,185
We were able to confirmed through
the surveillance footage at the Pizza Hut
227
00:14:14,187 --> 00:14:18,323
that there is no way that Jessica or
Jason could have been in Springfield
228
00:14:18,325 --> 00:14:20,725
at the time of the murder.
229
00:14:20,727 --> 00:14:25,129
It was readily apparent that they
were not the killers of Gary and Jan.
230
00:14:26,799 --> 00:14:29,100
[narrator] Having established
that Jessica and Jason
231
00:14:29,102 --> 00:14:33,004
did not have the opportunity
to kill Gary and Jan Tyrrell,
232
00:14:33,006 --> 00:14:35,306
they are eliminated as suspects.
233
00:14:38,143 --> 00:14:40,445
[Jessica] I did have a little
bit of relief.
234
00:14:43,182 --> 00:14:46,451
There was a lot of whispering
that I could have been involved,
235
00:14:48,020 --> 00:14:51,089
and knowing that...
236
00:14:51,091 --> 00:14:56,361
you're a murder suspect does
not, um, really sit well.
237
00:14:59,265 --> 00:15:01,733
[narrator] Investigators turned
their attention to Gary's brother,
238
00:15:01,735 --> 00:15:03,801
Larry Tyrrell.
239
00:15:03,803 --> 00:15:07,071
[Neal] We want to talk to Larry
because it was reported to us that,
240
00:15:07,073 --> 00:15:09,641
Gary and Larry were not
always real close.
241
00:15:11,844 --> 00:15:15,079
Is there some kind of
animosity there between them?
242
00:15:15,081 --> 00:15:17,982
We need to get Larry's story
and information from him,
243
00:15:17,984 --> 00:15:20,451
to see if he is
a possible suspect.
244
00:15:23,188 --> 00:15:27,659
Larry admitted that he and
Gary had not always been close,
245
00:15:27,661 --> 00:15:31,062
but had gotten much tighter
over, over time.
246
00:15:33,065 --> 00:15:35,500
Especially since the passing
of their mother.
247
00:15:36,535 --> 00:15:39,203
Larry said the last time
he spoke with Gary,
248
00:15:39,205 --> 00:15:43,207
-[cell phone ringing] -Was about
7:00 p.m. on the evening of April 30th.
249
00:15:44,610 --> 00:15:46,311
Viewing call records,
250
00:15:46,313 --> 00:15:50,148
uh, on Gary's phone, it did
show that Larry was being truthful
251
00:15:50,150 --> 00:15:53,751
that they had spoken
at that time.
252
00:15:53,753 --> 00:15:58,856
Larry informed us he was in Mountain
Grove on the evening of April 30th,
253
00:15:58,858 --> 00:16:01,826
which his wife
later corroborated.
254
00:16:01,828 --> 00:16:05,029
[narrator] Since Larry was an
hour away in Mountain Grove.
255
00:16:05,031 --> 00:16:07,565
He did not have the opportunity
to commit the murders,
256
00:16:07,567 --> 00:16:09,667
and is eliminated as
as a suspect.
257
00:16:09,669 --> 00:16:14,005
Based on the seven o'clock
conversation that Larry had with Gary,
258
00:16:14,007 --> 00:16:19,877
we believed that was the last known
contact of, um, any kind with Gary.
259
00:16:19,879 --> 00:16:24,182
We know now that Gary had
left class early,
260
00:16:24,184 --> 00:16:26,918
and that when he spoke with
Larry at seven o'clock that,
261
00:16:26,920 --> 00:16:29,520
the murders occurred
sometime after that.
262
00:16:31,056 --> 00:16:33,658
[narrator] Detectives asked
Larry if he knows anyone
263
00:16:33,660 --> 00:16:36,294
who might have wanted
to harm Gary and Jan.
264
00:16:39,164 --> 00:16:42,934
[Neal] Larry said Gary and Jan
had no enemies whatsoever,
265
00:16:42,936 --> 00:16:46,971
and could not think of why
anybody would want to harm them.
266
00:16:46,973 --> 00:16:50,541
He said the only motive he
could think of would be financial.
267
00:16:51,710 --> 00:16:55,179
My dad was big on diversifying.
268
00:16:55,181 --> 00:16:58,116
He grew up poor,
my mom grew up poor,
269
00:16:58,118 --> 00:17:01,953
and so making sure you don't
put all of your eggs in one basket
270
00:17:01,955 --> 00:17:03,988
was very important to him.
271
00:17:05,024 --> 00:17:07,892
So, my dad bought and sold
272
00:17:07,894 --> 00:17:10,461
gold and silver and platinum,
273
00:17:10,463 --> 00:17:14,565
weird collectable things
you might see in a museum.
274
00:17:15,701 --> 00:17:17,869
He was always looking for ways
to make money
275
00:17:17,871 --> 00:17:21,005
and it didn't really matter,
what, how he did it.
276
00:17:22,641 --> 00:17:24,976
[Neal] Larry discussed
some of the,
277
00:17:24,978 --> 00:17:27,612
dealings that Gary
was involved in.
278
00:17:27,614 --> 00:17:30,014
In terms of the gold
and silver trade.
279
00:17:33,018 --> 00:17:36,587
Gary would often times
do deals with random people
280
00:17:36,589 --> 00:17:40,224
and he said he discussed
with Gary the dangers of that.
281
00:17:44,029 --> 00:17:48,633
Based on Gary's dealings,
it is a possible scenario that,
282
00:17:48,635 --> 00:17:51,602
he encountered someone
that knew the valuables.
283
00:17:51,604 --> 00:17:53,037
Could it have been somebody that
284
00:17:53,039 --> 00:17:56,074
followed him home, could it have
been somebody that had staked him out
285
00:17:56,076 --> 00:18:00,244
and potentially was going
to burglarize the residence?
286
00:18:03,215 --> 00:18:05,917
[narrator] In the double
homicide of Gary and Jan Tyrrell,
287
00:18:05,919 --> 00:18:09,353
Detective McAmis is working
a new theory.
288
00:18:09,355 --> 00:18:14,058
Could the killer be connected to Gary's
side business of trading gold and silver?
289
00:18:15,994 --> 00:18:21,199
Larry notified us of a close
business associate of Gary's.
290
00:18:21,201 --> 00:18:25,870
They would often
conduct transactions together.
291
00:18:25,872 --> 00:18:30,641
Harold was not only a business
associate, but also a close friend that Jan
292
00:18:30,643 --> 00:18:33,111
would've allowed access
to their home.
293
00:18:33,879 --> 00:18:36,214
Harold knew how much Gary
was worth
294
00:18:36,216 --> 00:18:39,951
and what Gary was in
possession of at the residence.
295
00:18:41,120 --> 00:18:43,988
In Gary's phone records, we
found that Gary placed a call
296
00:18:43,990 --> 00:18:45,123
to his business associate
297
00:18:45,125 --> 00:18:49,927
at 6:57 p.m. on April 30th.
298
00:18:49,929 --> 00:18:55,199
We were able to speak with Harold and
he told us that he was in Mountain Grove
299
00:18:55,201 --> 00:19:00,972
at the time the incident occurred
which later on proved to be true.
300
00:19:00,974 --> 00:19:04,609
We were able to eliminate him
very quickly based on that.
301
00:19:07,980 --> 00:19:11,415
[narrator] With Gary's friend
and business associate ruled out.
302
00:19:11,417 --> 00:19:14,519
Detective McAmis finds himself
running out of leads.
303
00:19:17,089 --> 00:19:21,225
[Neal] We're trying to look at
all angles to figure out exactly
304
00:19:21,227 --> 00:19:24,028
who would have the means and
opportunity to commit this crime
305
00:19:24,030 --> 00:19:26,697
uh, it's a frustrating process
306
00:19:26,699 --> 00:19:28,933
having to go down
the different avenues,
307
00:19:28,935 --> 00:19:31,969
but we have to check all
the boxes and make sure
308
00:19:31,971 --> 00:19:33,638
that there is no stone
left unturned.
309
00:19:37,176 --> 00:19:39,477
It's a very hard
pill to swallow,
310
00:19:39,479 --> 00:19:41,879
even though you know and
understand that law enforcement
311
00:19:41,881 --> 00:19:43,347
is doing their job.
312
00:19:43,349 --> 00:19:48,452
I really just wanted them to
move on to actually, "Who did this?"
313
00:19:48,454 --> 00:19:51,222
I really had to put our faith
in the justice system and that,
314
00:19:51,224 --> 00:19:54,025
the justice system would
do us right.
315
00:19:56,128 --> 00:19:59,564
[narrator] But then, Detective
McAmis finally catches a break.
316
00:20:01,133 --> 00:20:06,170
[Neal] The DNA from the latex glove
showed to have male characteristics.
317
00:20:08,173 --> 00:20:11,475
So, we now know that we're
dealing with a male suspect.
318
00:20:13,278 --> 00:20:16,380
But when checking the DNA
from the glove,
319
00:20:17,015 --> 00:20:18,683
in the DNA database,
320
00:20:18,685 --> 00:20:20,084
there was no match.
321
00:20:27,226 --> 00:20:30,294
[narrator] Detective McAmis
goes back to the drawing board.
322
00:20:30,296 --> 00:20:33,531
Looking for any new clues that
could lead to a male suspect,
323
00:20:33,533 --> 00:20:36,033
who had access
to the Tyrrell home.
324
00:20:39,037 --> 00:20:44,909
[Neal] When speaking with Larry
about who had access to the Tyrrell home,
325
00:20:44,911 --> 00:20:50,948
he said, it was just a very select few
people, a couple of close family members
326
00:20:50,950 --> 00:20:54,352
and he also said Gary's best
friend Mark Porter.
327
00:20:59,858 --> 00:21:03,961
Mark was frequently visiting
the Tyrrell residence,
328
00:21:03,963 --> 00:21:09,200
Mark would have had knowledge of the
valuables that were inside the Tyrrell home.
329
00:21:10,369 --> 00:21:15,172
Gary was mentoring Mark
with the gold and silver trade.
330
00:21:15,174 --> 00:21:19,677
[Jessica] My dad did not have a lot of close
friends and so I really thought it was great
331
00:21:19,679 --> 00:21:22,313
that he had someone he could
do things with.
332
00:21:23,982 --> 00:21:26,384
[narrator] Detective McAmis
invites Mark Porter
333
00:21:26,386 --> 00:21:28,653
down to the station
for an interview.
334
00:21:40,666 --> 00:21:42,633
Okay.
335
00:21:42,635 --> 00:21:44,769
[Neal] My first impression of
Mark Porter was,
336
00:21:44,771 --> 00:21:48,272
he was obviously
a very intelligent individual,
337
00:21:50,242 --> 00:21:53,611
but at the same time he was
also extremely arrogant.
338
00:21:53,613 --> 00:21:56,247
Almost to the point
of being pompous.
339
00:21:56,249 --> 00:21:58,149
Um, there was no doubt
that he thought he was
340
00:21:58,151 --> 00:22:00,985
the smartest person in the room.
341
00:22:02,387 --> 00:22:06,057
Mark told us that he and Gary,
um, met each other
342
00:22:06,059 --> 00:22:07,792
in the Mountain Grove
school district
343
00:22:07,794 --> 00:22:11,128
where Mark was
the superintendent of schools
344
00:22:11,130 --> 00:22:13,497
and Gary was his assistant.
345
00:22:17,135 --> 00:22:20,738
Mark's initial description
of his relationship
346
00:22:20,740 --> 00:22:22,173
with Gary was very odd.
347
00:22:22,175 --> 00:22:26,010
He described him as just being
more or less acquaintances.
348
00:22:27,245 --> 00:22:29,980
[Jessica] That was
really disheartening
349
00:22:29,982 --> 00:22:32,850
because my dad
definitely felt like,
350
00:22:32,852 --> 00:22:35,152
Mark was his best friend.
351
00:22:38,023 --> 00:22:40,324
[Neal] When Mark kind of
down played the relationship
352
00:22:40,326 --> 00:22:41,792
and put it off as just kind of
353
00:22:41,794 --> 00:22:45,596
being acquaintances, that was
definitely a red flag and alarming to us.
354
00:22:47,733 --> 00:22:52,370
[Roots] I think most people want to
downplay their relationship to the victim,
355
00:22:52,372 --> 00:22:56,073
especially if they are
in fact considered suspects.
356
00:22:57,342 --> 00:23:00,077
The belief or the idea
that somehow you're throwing
357
00:23:00,079 --> 00:23:02,780
the investigators off the scent,
358
00:23:02,782 --> 00:23:06,117
um, it's something that I think a
lot of people will utilize as a ploy
359
00:23:06,119 --> 00:23:09,987
to distance themselves
from an investigation.
360
00:23:11,623 --> 00:23:14,625
[narrator] Detective McAmis
asks Mark about his whereabouts
361
00:23:14,627 --> 00:23:17,094
on the night the Tyrrells
were murdered.
362
00:23:19,531 --> 00:23:24,068
On the day of April 30th, he went to
work very early at approximately 5:30 a.m.
363
00:23:24,070 --> 00:23:29,807
He said he worked at IBM
throughout the entirety of the day.
364
00:23:29,809 --> 00:23:36,380
At 7:45 p.m. Mark said he left to meet Gary
at a local McDonald's at eight o'clock.
365
00:23:37,849 --> 00:23:42,052
Where he said he waited
for about 45 minutes for Gary.
366
00:23:42,054 --> 00:23:44,889
When Gary did not show up
for the meeting at McDonald's,
367
00:23:44,891 --> 00:23:48,159
he went on ahead and just
drove to the Tyrrell residence.
368
00:23:50,262 --> 00:23:51,429
[doorbell ringing]
369
00:23:51,730 --> 00:23:54,165
But said he, he could not get
any answer of any kind,
370
00:23:54,167 --> 00:23:56,934
he said, he didn't notice
anything wrong,
371
00:23:56,936 --> 00:23:59,904
and so after leaving
the Tyrrell residence.
372
00:23:59,906 --> 00:24:02,072
He went back to work,
373
00:24:02,074 --> 00:24:05,376
he said he arrived at
approximately 9:15 p.m.
374
00:24:06,945 --> 00:24:12,149
But we were able to confirm through Mark's
brother that he had in fact seen Mark
375
00:24:12,151 --> 00:24:18,122
arrive at the IBM office at approximately
9:15 on the night of April 30th.
376
00:24:18,124 --> 00:24:22,893
We were able to eliminate him
very quickly based on that.
377
00:24:22,895 --> 00:24:27,731
[narrator] With Mark Porter cleared in the
double homicide of Gary and Jan Tyrrell.
378
00:24:27,733 --> 00:24:31,469
Detective McAmis is back to
square one in the investigation.
379
00:24:33,238 --> 00:24:35,739
It's very frustrating
in cases with DNA
380
00:24:35,741 --> 00:24:38,876
whether there is no offender
match in the database,
381
00:24:38,878 --> 00:24:42,413
and unfortunately you have
to sort of sit and wait until
382
00:24:42,415 --> 00:24:46,350
that offender gets arrested for
something else and the link gets made.
383
00:24:50,155 --> 00:24:51,655
[camera shutter clicking]
384
00:24:51,657 --> 00:24:55,025
[narrator] With CSI having
finished processing the crime scene,
385
00:24:56,161 --> 00:24:58,629
police release
the Tyrrell home to Jessica.
386
00:25:03,301 --> 00:25:04,368
[Jessica] Being...
387
00:25:06,238 --> 00:25:09,006
in their house, [sighs]
388
00:25:10,308 --> 00:25:11,308
and...
389
00:25:12,244 --> 00:25:13,611
they were not there,
390
00:25:14,412 --> 00:25:16,280
and they were not coming back,
391
00:25:18,049 --> 00:25:19,950
was incredibly hard.
392
00:25:22,754 --> 00:25:25,589
[Neal] Jason and Jessica went
throughout the home
393
00:25:25,591 --> 00:25:28,225
trying to identify anything
that could be missing.
394
00:25:29,694 --> 00:25:35,165
A couple of ivory tusks were
missing from the basement.
395
00:25:35,167 --> 00:25:38,636
Based on the location and
the composition of the material
396
00:25:38,638 --> 00:25:41,238
that we found around both
of the bodies,
397
00:25:41,240 --> 00:25:45,409
that led us to believe that the tusk
was possibly used as a murder weapon.
398
00:25:45,944 --> 00:25:47,478
[coins jingling]
399
00:25:47,480 --> 00:25:52,616
Jessica pointed out to us that
her father often kept a tub of coins
400
00:25:52,618 --> 00:25:54,251
next to his desk
401
00:25:54,986 --> 00:25:57,154
and she said
the coins were missing.
402
00:25:58,857 --> 00:26:00,324
During the processing
of the scene,
403
00:26:00,326 --> 00:26:05,195
we located a coin ledger
that Gary had.
404
00:26:05,197 --> 00:26:10,968
The list indicated that he had
over $1,330 in face value coins,
405
00:26:10,970 --> 00:26:15,105
but the coins were worth
approximately 22,000 dollars.
406
00:26:18,176 --> 00:26:21,312
Mark Porter would
have obviously known
407
00:26:21,314 --> 00:26:25,482
that those coins would have been much
more valuable than just the face value.
408
00:26:30,655 --> 00:26:32,122
Based upon our findings,
409
00:26:32,157 --> 00:26:36,594
we're gonna definitely have to take
a much harder look into Mark Porter.
410
00:26:46,004 --> 00:26:49,640
[narrator] After discovering the theft
of Gary Tyrell's silver coin collection
411
00:26:49,642 --> 00:26:51,609
and a possible murder weapon.
412
00:26:51,611 --> 00:26:53,310
[gunshot]
413
00:26:53,312 --> 00:26:57,982
Detective McAmis is zeroing in
on a previously cleared suspect,
414
00:26:57,984 --> 00:27:00,651
in the double homicide
of Gary and Jan Tyrrell.
415
00:27:01,753 --> 00:27:04,555
Gary's close friend,
Mark Porter.
416
00:27:11,229 --> 00:27:13,964
[Neal] While speaking
with Larry again,
417
00:27:14,833 --> 00:27:17,134
he seemed bothered by something.
418
00:27:17,136 --> 00:27:21,271
Larry got really stern
with me and very focused.
419
00:27:24,209 --> 00:27:28,045
He told me that he was very
suspicious of Mark Porter.
420
00:27:31,850 --> 00:27:33,117
Larry informed us
421
00:27:33,119 --> 00:27:36,320
that Mark had
a severe gambling problem.
422
00:27:36,322 --> 00:27:39,990
He told us that Mark should be
a very wealthy individual
423
00:27:39,992 --> 00:27:43,060
because he has
a very lucrative job at IBM,
424
00:27:43,062 --> 00:27:46,330
making a lot of money,
and is extremely successful.
425
00:27:49,868 --> 00:27:53,570
But Mark had asked for a
quarter-million-dollar loan from Gary.
426
00:27:57,375 --> 00:27:59,643
Larry just thought
that was preposterous
427
00:27:59,645 --> 00:28:03,080
and said Gary was not gonna
give him that kind of money,
428
00:28:03,082 --> 00:28:05,916
and was shocked that Mark
would even have the audacity
429
00:28:05,918 --> 00:28:07,518
to ask for such a sum.
430
00:28:10,822 --> 00:28:11,789
[Keira] People who gamble
431
00:28:11,823 --> 00:28:14,692
often times have
impulse control problems,
432
00:28:14,694 --> 00:28:16,927
or problems
in terms of their thinking.
433
00:28:16,929 --> 00:28:19,797
They don't see their wins
as independent events,
434
00:28:19,799 --> 00:28:21,632
they see themselves
on a lucky streak.
435
00:28:21,634 --> 00:28:22,866
And if you're thinking
436
00:28:22,868 --> 00:28:25,169
in cognitively distorted ways
like that,
437
00:28:25,171 --> 00:28:27,404
it may not be so much of a leap
438
00:28:27,406 --> 00:28:29,373
to think that you might resort
to violence
439
00:28:29,375 --> 00:28:31,141
to repay your debts.
440
00:28:33,311 --> 00:28:35,646
[Neal] If Mark is in debt
441
00:28:35,648 --> 00:28:37,648
to that point to where
he's needing to request
442
00:28:37,650 --> 00:28:40,117
a quarter of a million dollars
from Gary,
443
00:28:40,119 --> 00:28:42,386
it could obviously put
some strain
444
00:28:42,388 --> 00:28:45,155
and give motive
for these crimes.
445
00:28:47,392 --> 00:28:50,928
It was told to us that
Mark was a very religious man,
446
00:28:50,930 --> 00:28:52,362
a family man.
447
00:28:53,364 --> 00:28:55,399
Obviously very intelligent.
448
00:28:55,401 --> 00:28:56,633
But in digging further,
449
00:28:56,635 --> 00:28:59,103
when we spoke
with past co-workers
450
00:28:59,105 --> 00:29:00,871
and other people that knew Mark,
451
00:29:00,873 --> 00:29:04,141
uh, there was a different
picture that was being painted.
452
00:29:04,943 --> 00:29:06,944
[narrator]
With this new information,
453
00:29:06,946 --> 00:29:09,980
Mark Porter goes from
being a friend of the Tyrrells
454
00:29:09,982 --> 00:29:11,615
to being their possible killer.
455
00:29:14,119 --> 00:29:15,719
To build their case,
456
00:29:15,721 --> 00:29:18,188
detectives start digging
into his background.
457
00:29:20,225 --> 00:29:22,159
[Neal] We were able
to locate evidence
458
00:29:22,161 --> 00:29:24,027
that showed
Mark Porter had gambled
459
00:29:24,029 --> 00:29:26,363
hundreds of thousands
of dollars,
460
00:29:26,365 --> 00:29:28,899
uh, throughout
a several-year time period
461
00:29:28,901 --> 00:29:30,501
at various casinos.
462
00:29:34,305 --> 00:29:35,973
We also found that
463
00:29:35,975 --> 00:29:39,176
that Mark was in some
serious financial difficulty.
464
00:29:39,178 --> 00:29:41,245
Mark got rid
of a Lexus they had,
465
00:29:41,247 --> 00:29:43,413
and we also saw
where he had sold
466
00:29:43,415 --> 00:29:45,949
a motorcycle that he was
in possession of.
467
00:29:46,985 --> 00:29:47,951
[narrator] Having established
468
00:29:47,953 --> 00:29:49,987
that Mark Porter
had a clear motive...
469
00:29:49,989 --> 00:29:51,388
[gunshot]
470
00:29:52,690 --> 00:29:54,324
[narrator]
investigators need to prove
471
00:29:54,326 --> 00:29:57,327
whether he had the opportunity
to kill the the Tyrrells.
472
00:29:59,731 --> 00:30:01,098
Looking for answers,
473
00:30:01,100 --> 00:30:04,835
Detective McAmis brings
Mark's brother and boss, Bruce,
474
00:30:04,837 --> 00:30:06,236
in for questioning.
475
00:30:07,472 --> 00:30:11,141
When we asked him
about Mark's gambling issues,
476
00:30:11,143 --> 00:30:12,843
he almost seemed put off
477
00:30:12,845 --> 00:30:13,977
and surprised and shocked
478
00:30:13,979 --> 00:30:17,347
that we would even be talking
about such a thing.
479
00:30:17,349 --> 00:30:20,350
Mark was above that,
that he was far too good,
480
00:30:20,352 --> 00:30:23,320
and said that Mark was
not a gambler of any kind.
481
00:30:24,122 --> 00:30:25,823
For his brother not to know
482
00:30:25,825 --> 00:30:28,058
of the gambling issues
going on with Mark,
483
00:30:28,060 --> 00:30:29,893
it was readily apparent to us
484
00:30:29,895 --> 00:30:32,396
that Mark was
leading a double life.
485
00:30:33,331 --> 00:30:35,232
[narrator]
Investigators question Bruce
486
00:30:35,234 --> 00:30:39,203
about seeing Mark
at the office around 9:00 p.m.
487
00:30:39,205 --> 00:30:42,272
[Neal] He confirmed
that he, in fact, did see
488
00:30:42,841 --> 00:30:45,509
Mark at the IBM office.
489
00:30:45,511 --> 00:30:47,978
He arrived
at about 9:15 that night.
490
00:30:47,980 --> 00:30:50,747
What he told us that was a
little different than Mark was,
491
00:30:50,749 --> 00:30:53,817
he said he had actually got in
to the office before that,
492
00:30:53,819 --> 00:30:56,119
had seen some
of Mark's belongings,
493
00:30:56,121 --> 00:30:57,888
and that Mark was gone
494
00:30:57,890 --> 00:31:00,123
for approximately 45 minutes.
495
00:31:01,459 --> 00:31:02,926
Mark had not told us that.
496
00:31:02,928 --> 00:31:05,195
Mark said that he arrived
at the office,
497
00:31:05,197 --> 00:31:08,131
and said that his brother
just happened to drive by.
498
00:31:08,133 --> 00:31:10,267
So, there was
a little discrepancy
499
00:31:10,269 --> 00:31:12,569
in their scenarios right there.
500
00:31:14,639 --> 00:31:15,806
Right now, there's a whole bunch
501
00:31:15,808 --> 00:31:19,643
of circumstantial evidence
pointing towards Mark
502
00:31:19,645 --> 00:31:22,412
as being our prime suspect,
without a doubt.
503
00:31:22,414 --> 00:31:23,513
The problem is, is we have
504
00:31:23,515 --> 00:31:27,484
no hard physical evidence
on Mark to this point.
505
00:31:31,656 --> 00:31:35,058
[narrator] With the evidence
stacking up against Mark Porter,
506
00:31:35,060 --> 00:31:37,728
Detective McAmis
hauls him down to the station
507
00:31:37,730 --> 00:31:39,596
for another round
of questioning.
508
00:31:41,232 --> 00:31:45,168
Mark denies both the loan
and gambling issues.
509
00:31:45,170 --> 00:31:47,237
At one point, he finally admits
510
00:31:47,239 --> 00:31:49,072
that he gambles a little bit,
511
00:31:49,074 --> 00:31:51,141
but he says that
it's no big deal
512
00:31:51,143 --> 00:31:53,110
and that it's not a problem.
513
00:31:53,112 --> 00:31:55,412
And essentially
played that off as
514
00:31:55,414 --> 00:31:57,114
money is not an issue.
515
00:31:58,049 --> 00:31:59,917
So, we asked directly
516
00:31:59,919 --> 00:32:02,452
if he had any involvement
in the crimes.
517
00:32:05,056 --> 00:32:09,026
And he denied anything
to do with it.
518
00:32:10,628 --> 00:32:13,897
[Michael] The fact that Mark presents
as this successful business man
519
00:32:13,899 --> 00:32:16,934
and yet ends up immersed
in this horrible tragedy,
520
00:32:16,936 --> 00:32:19,136
speaks to just how insidious
521
00:32:19,138 --> 00:32:21,605
and dangerous
a gambling addiction is.
522
00:32:21,607 --> 00:32:26,410
I mean, just for the need
to survive the addiction, um,
523
00:32:27,211 --> 00:32:30,013
can motivate
extremely dangerous behavior
524
00:32:30,015 --> 00:32:31,648
up to and including murder.
525
00:32:32,717 --> 00:32:34,985
[narrator]
Detective McAmis redirects,
526
00:32:34,987 --> 00:32:38,322
and asks Mark when he was
last inside the Tyrrell home.
527
00:32:39,123 --> 00:32:40,290
[Neal] Mark told us that
528
00:32:40,292 --> 00:32:42,759
he last time he was
at the Tyrrell home
529
00:32:42,761 --> 00:32:44,861
was on the Monday
before the crime,
530
00:32:44,863 --> 00:32:47,831
which would have been just
a couple of days previously
531
00:32:47,833 --> 00:32:49,967
to when we believe
the homicides occurred.
532
00:32:51,002 --> 00:32:54,171
So, we asked Mark
to submit to a DNA sample.
533
00:32:57,709 --> 00:33:00,210
And he was immediately
stand-offish about that
534
00:33:00,212 --> 00:33:02,012
and that he would need
to speak with a lawyer
535
00:33:02,014 --> 00:33:05,082
before he'd be willing
to give us a DNA sample.
536
00:33:06,217 --> 00:33:11,722
It was a huge, huge flag
for us. Very alarming.
537
00:33:11,724 --> 00:33:14,891
We're trying to solve
the murder of his best friend,
538
00:33:14,893 --> 00:33:18,628
and here he is,
he's not willing to cooperate.
539
00:33:18,630 --> 00:33:21,264
It was quite the telling sign
right there
540
00:33:21,266 --> 00:33:23,033
that Mark had something to hide.
541
00:33:26,771 --> 00:33:29,206
[narrator] Investigators have
their prime suspect
542
00:33:29,208 --> 00:33:32,376
in the brutal double homicide
of Gary and Jan Tyrrell...
543
00:33:33,611 --> 00:33:36,346
Gary's close friend,
Mark Porter.
544
00:33:38,082 --> 00:33:39,383
[gunshot]
545
00:33:39,385 --> 00:33:41,785
[narrator] But without
a matching DNA sample
546
00:33:41,787 --> 00:33:44,287
to directly link Mark
to the murders,
547
00:33:44,289 --> 00:33:48,225
Detective Neal McAmis
searches for more evidence,
548
00:33:48,227 --> 00:33:50,660
and finds it
in a surprising place.
549
00:33:52,196 --> 00:33:54,031
[Neal] The investigator that
550
00:33:54,033 --> 00:33:58,301
decided to look for Mark
in the pawn database,
551
00:33:58,303 --> 00:34:00,570
it was a brilliant move
on his part.
552
00:34:07,912 --> 00:34:14,117
Mark had sold approximately
$1,321 worth of coins.
553
00:34:14,119 --> 00:34:16,953
It was close
to the amount of face value
554
00:34:16,955 --> 00:34:20,524
that was listed on
Gary's ledger that he had.
555
00:34:24,729 --> 00:34:26,930
But when we, in fact, went to
556
00:34:26,932 --> 00:34:29,566
view the transaction
at the coin shop,
557
00:34:30,768 --> 00:34:33,403
we found out that
Mark was actually paid
558
00:34:33,405 --> 00:34:36,306
over $18,500 for the coins,
559
00:34:36,308 --> 00:34:37,941
which is right in line
560
00:34:37,943 --> 00:34:40,477
with what Gary had listed
on his ledger.
561
00:34:43,381 --> 00:34:46,016
The owner of the coin shop
confirmed that, in fact,
562
00:34:46,018 --> 00:34:50,087
he did do
a large transaction of coins
563
00:34:50,089 --> 00:34:52,923
on the day
after the bodies were found.
564
00:34:52,925 --> 00:34:55,826
The owner of the coin shop
also has surveillance footage
565
00:34:55,828 --> 00:34:57,327
which indeed showed
566
00:34:57,329 --> 00:35:01,765
Mark Porter in the coin shop
doing the transaction.
567
00:35:01,767 --> 00:35:04,067
And Mark Porter was
wearing the same
568
00:35:04,069 --> 00:35:07,070
clothing he had on
whenever we interviewed him,
569
00:35:07,072 --> 00:35:10,207
shortly after he did
the selling of the coins.
570
00:35:11,742 --> 00:35:14,778
As intelligent as Mark is,
571
00:35:14,780 --> 00:35:17,280
it was very apparent,
just his stupidity,
572
00:35:17,282 --> 00:35:19,249
when it came to criminal acts.
573
00:35:20,284 --> 00:35:22,652
Even though we have the coins,
574
00:35:22,654 --> 00:35:24,921
we still needed something
a lot more solid
575
00:35:24,923 --> 00:35:27,524
in terms of physical evidence
to proceed with the case.
576
00:35:28,926 --> 00:35:29,960
We know that we are
577
00:35:29,962 --> 00:35:33,497
somehow going to have
to obtain Mark's DNA.
578
00:35:35,066 --> 00:35:38,101
[narrator]
To obtain Mark Porter's DNA,
579
00:35:38,103 --> 00:35:42,272
Detective McAmis organizes
a large undercover task force.
580
00:35:44,375 --> 00:35:46,209
[Neal]
We put undercover officers,
581
00:35:46,211 --> 00:35:50,080
uh, maintaining surveillance
of Mark for weeks at a time,
582
00:35:50,082 --> 00:35:51,848
to try to somehow
583
00:35:51,850 --> 00:35:54,317
discreetly get his DNA
without him knowing.
584
00:36:02,026 --> 00:36:03,860
We're looking for
any type of article
585
00:36:03,862 --> 00:36:05,896
that Mark might handle
586
00:36:05,898 --> 00:36:09,299
uh, or use
that would produce his DNA.
587
00:36:09,734 --> 00:36:10,967
During this time,
588
00:36:10,969 --> 00:36:13,637
narcotics investigators are
relaying to us
589
00:36:13,639 --> 00:36:17,140
that Mark's behavior
is very strange and odd.
590
00:36:17,142 --> 00:36:18,441
He would go into a restaurant
591
00:36:18,443 --> 00:36:20,343
and he would not leave
anything behind
592
00:36:20,345 --> 00:36:21,978
for them to obtain,
593
00:36:21,980 --> 00:36:24,848
and it was
becoming very challenging
594
00:36:24,850 --> 00:36:28,318
for our undercover officers
to try to get his DNA.
595
00:36:29,754 --> 00:36:31,688
[narrator]
After weeks of surveillance,
596
00:36:31,690 --> 00:36:34,357
Detective McAmis
finally catches a break...
597
00:36:35,893 --> 00:36:39,329
when Mark Porter visits
a lube shop for an oil change.
598
00:36:41,065 --> 00:36:42,699
[Neal]
One of our undercover officers
599
00:36:42,701 --> 00:36:45,035
went in and got
an oil change with him.
600
00:36:46,938 --> 00:36:49,306
Mark had been drinking
from a coffee cup.
601
00:36:52,176 --> 00:36:55,111
And when Mark's vehicle
was finished,
602
00:36:55,113 --> 00:36:58,248
Mark put the coffee cup down
and left it behind.
603
00:36:59,951 --> 00:37:03,587
Our undercover officer
immediately seized the cup.
604
00:37:03,589 --> 00:37:05,956
And we transported it directly
605
00:37:05,958 --> 00:37:09,059
to the Missouri State
Highway Patrol lab for testing.
606
00:37:10,461 --> 00:37:13,330
Less than 24 hours later,
we had our match.
607
00:37:15,333 --> 00:37:16,633
It is confirmed
608
00:37:16,635 --> 00:37:18,635
that Mark's DNA
is a match of that
609
00:37:18,637 --> 00:37:20,270
that we found on the latex glove
610
00:37:20,272 --> 00:37:22,239
that was located
in the Tyrrell home.
611
00:37:27,178 --> 00:37:29,145
The feeling of elation was...
612
00:37:29,147 --> 00:37:31,014
it's almost indescribable.
613
00:37:31,016 --> 00:37:32,949
We knew that we were
gonna be able to bring
614
00:37:32,951 --> 00:37:35,218
some kind of closure
to the Tyrrell family
615
00:37:35,220 --> 00:37:37,187
along with being able
to put away
616
00:37:37,189 --> 00:37:39,422
a very violent and vicious man.
617
00:37:41,259 --> 00:37:45,095
[narrator] Detective McAmis
is now able to piece together
618
00:37:45,097 --> 00:37:48,298
Gary and Jan Tyrrell's
final 24 hours.
619
00:37:51,269 --> 00:37:52,869
[Neal] Mark knows
that Gary is supposed
620
00:37:52,871 --> 00:37:55,372
to teach a class that evening
621
00:37:55,374 --> 00:37:57,974
from 5:30 until 9:00 p.m.
622
00:37:59,777 --> 00:38:01,611
- [doorbell rings]
- Approximately 5:30,
623
00:38:01,613 --> 00:38:03,546
Mark went
to the Tyrrell residence...
624
00:38:06,817 --> 00:38:08,618
knowing that she would have
been a roadblock.
625
00:38:11,989 --> 00:38:15,125
We believe that Jan turned down
626
00:38:15,127 --> 00:38:16,660
Mark's loan request.
627
00:38:19,030 --> 00:38:21,364
And it was at that point
Mark snapped.
628
00:38:22,233 --> 00:38:24,100
[narrator] Consumed with rage,
629
00:38:24,102 --> 00:38:26,202
Mark Porter grabs a walrus tusk
630
00:38:26,204 --> 00:38:28,605
from a nearby table
and attacks Jan.
631
00:38:34,312 --> 00:38:36,980
[Neal] After Mark kills Jan,
632
00:38:36,982 --> 00:38:39,249
we believe that he was looking
throughout the home.
633
00:38:39,251 --> 00:38:42,085
He would've had knowledge
of the valuables.
634
00:38:45,022 --> 00:38:46,956
Gary let class out early
that night
635
00:38:46,958 --> 00:38:48,425
shortly before 7:00 p.m.
636
00:38:48,427 --> 00:38:49,693
[cell phone ringing]
637
00:38:49,827 --> 00:38:52,429
[Neal] It's right after that
when Gary has a conversation
638
00:38:52,431 --> 00:38:54,097
with his brother Larry.
639
00:38:55,199 --> 00:38:56,866
We believe that Gary went home
640
00:38:56,868 --> 00:38:58,635
shortly after that conversation.
641
00:39:01,939 --> 00:39:05,408
And that's when he interrupted
Mark's crime-in-progress.
642
00:39:05,410 --> 00:39:09,045
Mark possibly grabbed
one of Gary's guns.
643
00:39:10,781 --> 00:39:12,315
He runs upstairs.
644
00:39:14,285 --> 00:39:16,119
And there's the confrontation
645
00:39:16,121 --> 00:39:18,254
right at the top
of the stairway.
646
00:39:24,295 --> 00:39:26,363
- [gunshots]
- [thuds]
647
00:39:26,365 --> 00:39:28,164
[Neal]
Fired a couple shots at Gary.
648
00:39:28,199 --> 00:39:29,532
[gunshot]
649
00:39:31,102 --> 00:39:34,504
[Neal] And then Mark
proceeded to beat Gary
650
00:39:34,506 --> 00:39:36,139
as he lay on the ground.
651
00:39:43,848 --> 00:39:45,181
Mark gathers up
652
00:39:45,183 --> 00:39:47,951
the belongings, the walrus tusk,
653
00:39:47,953 --> 00:39:51,154
the murder weapon
in terms of the gun,
654
00:39:51,156 --> 00:39:52,989
and the items that he stole.
655
00:39:55,726 --> 00:39:56,793
He left the house,
656
00:39:56,795 --> 00:39:58,995
even locking the door
after he left,
657
00:39:58,997 --> 00:40:01,297
and fled the scene at that time.
658
00:40:04,735 --> 00:40:06,503
There was never any indication
659
00:40:06,505 --> 00:40:08,605
of any type
of remorse whatsoever.
660
00:40:08,607 --> 00:40:11,408
There was never an apology
to the family.
661
00:40:11,410 --> 00:40:13,910
Nothing at all
to indicate that Mark felt bad
662
00:40:13,912 --> 00:40:16,012
about what he did.
663
00:40:16,014 --> 00:40:19,349
Throughout, he continued
his arrogance and pompousness
664
00:40:19,351 --> 00:40:22,185
and it just speaks volumes
of the type of individual
665
00:40:22,187 --> 00:40:23,586
that Mark really is.
666
00:40:24,922 --> 00:40:26,156
With the viciousness
of the crime
667
00:40:26,158 --> 00:40:27,957
and the lack of remorse,
668
00:40:27,959 --> 00:40:31,961
Mark is most definitely
a sociopathic type.
669
00:40:33,063 --> 00:40:35,365
[Roots]
Mark's narcissistic behavior
670
00:40:35,367 --> 00:40:40,236
and constant need
to lie to people,
671
00:40:40,238 --> 00:40:43,373
uh, to show that he was
672
00:40:43,375 --> 00:40:47,076
successful and wealthy
and capable,
673
00:40:47,078 --> 00:40:49,112
um, came shattering down
around him,
674
00:40:49,114 --> 00:40:52,449
um, when his gambling debts
caught up to him.
675
00:40:56,320 --> 00:40:58,321
[Keira] I don't necessarily
know that he went there
676
00:40:58,323 --> 00:41:00,223
planning to commit murder,
677
00:41:00,225 --> 00:41:02,192
but I think it was
a perfect storm.
678
00:41:03,928 --> 00:41:05,094
[narrator]
Mark Porter is charged
679
00:41:05,096 --> 00:41:06,930
with first-degree murder
680
00:41:06,932 --> 00:41:09,199
in the deaths
of Gary and Jan Tyrrell.
681
00:41:09,733 --> 00:41:11,067
He pleads guilty
682
00:41:11,069 --> 00:41:14,137
and receives two
consecutive life-sentences.
683
00:41:16,807 --> 00:41:19,209
Arresting Mark was
most definitely
684
00:41:19,211 --> 00:41:21,077
one of the highlights
of my career.
685
00:41:22,413 --> 00:41:24,747
Being able to bring some closure
686
00:41:24,749 --> 00:41:26,249
to the Tyrrell family
687
00:41:26,251 --> 00:41:28,551
was just
an indescribable feeling.
688
00:41:32,723 --> 00:41:33,823
I hope that
689
00:41:33,825 --> 00:41:35,992
the family
gets some sense of justice
690
00:41:35,994 --> 00:41:39,062
knowing that this
vicious, brutal killer
691
00:41:39,064 --> 00:41:41,297
will spend the rest
of his life in prison.
692
00:41:44,101 --> 00:41:45,568
[Jessica] I miss most...
693
00:41:47,071 --> 00:41:48,638
just them being here.
694
00:41:54,044 --> 00:41:56,546
Their support. Um...
695
00:42:00,050 --> 00:42:02,385
They were
always a phone call away.
696
00:42:03,888 --> 00:42:06,656
[narrator] Despite the tragedy
of losing her parents,
697
00:42:06,658 --> 00:42:07,824
Jessica Tyrrell
698
00:42:07,826 --> 00:42:10,426
continues to work
to honor their memories.
699
00:42:12,396 --> 00:42:15,431
[Jessica] I would like
my parents to be remembered
700
00:42:15,433 --> 00:42:19,068
as warm, loving couple
701
00:42:19,070 --> 00:42:21,938
who helped so many people.
702
00:42:23,307 --> 00:42:25,074
They made
a difference in the lives
703
00:42:25,076 --> 00:42:26,342
of those around them.