[phone ringing]
This is clearly a targeted attack.
Anna Lisa was a beautiful, stunning woman.
Anybody that spoke about her
always spoke about how nice she was.
[man] She was stabbed in the face, in the neck and in the chest.
Who could have been this vicious to do this
to this woman?
The word was that this was probably someone she knew.
This is about winning and losing to people like this.
[man 2] I knew that he was lying to us about something.
Clearly, there was so much more going on.
We just had to figure out what it was.
[dial tone beeps]
[female narrator] Every day in North America, dozens of people are murdered.
The key to solving the toughest of these homicides
lies in the final 24 hours of the victim's life.
To crack the case,
detectives must reconstruct that critical timeline.
The minutes and hours containing evidence
that can help unlock the mystery and catch the killer.
Located just 34 miles northeast of wealthy Manhattan,
Stamford, Connecticut has become a white collar hub of its own.
Stamford is a very vibrant city.
Its motto is, "The city that works."
It's just very affluent, full of young professionals.
The downtown is just saturated with Fortune 500 companies,
startups, restaurants.
You have waterways and suburbs.
It's a beautiful place to live.
[female narrator] But for one resident, that beautiful place turns ugly.
Just afternoon on a chilly November day,
a woman dials 911 from the marina.
It is a female caller relating that her neighbor
was attacked and she saw a male.
She can hear some screaming.
And she gives an address.
The address that the 911 caller gave
was an industrial area and there were
no residences there.
So the dispatcher is trying to confirm that address
and all of a sudden, the 911 caller hung up.
[dial tone beeps]
[female narrator] Based on the location of the Marina payphone,
the dispatcher locates a similar sounding address
less than a mile away.
123 Harbor Drive, which is in a section
of the city called Chapin, a very affluent area,
not an area that we consider to be high crime.
Uniformed police officer pulls up to the condo.
He tries the door which is unlocked
and he opens up that door and is now looking at a...
just a tremendously violent scene in the foyer.
There is a body of a female lying on her back.
[female narrator] The young woman is dead.
[Alison] There's a lot of blood.
She has been attacked.
There's a dumbbell nearby that has obviously been used
in the attack because it has blood on it.
The responding officer starts notifying dispatch
and also starts crime scene security.
In other words, no one's coming in.
He's just shutting down the entire area.
[camera shutter clicks]
[female narrator] Detective Greg Holt with the Stamford Police Department's
Major Crime Squad is tasked to lead the investigation.
I arrive on scene, the CSI team
start to process the crime scene,
start to process the body.
They're documenting it with photography,
with measurements.
They're dusting for prints.
There is overturned furniture.
There's potted plants, potting soil everywhere.
The victim was stabbed in the face, in the neck
and in the chest.
The stab wounds were interesting because
you have that one in the face which could have occurred
during a struggle or it could be there to disfigure that victim.
The victim is Anna Lisa Raymundo
and this is her condo.
[female narrator] That 32-year-old woman is an executive
at a pharmaceutical company.
A hair was located laying on the victim's chest,
a single hair that was collected.
One of the detectives had entered the powder room,
and he noticed a minute drop of blood just below
one of the handles to the faucet.
And that was collected for future processing.
There is no forced entry visible at the front door.
It was more likely that the perpetrator had knocked
on the door and the victim allowed the perp
into the house.
Why would you let someone into the house
if you didn't know them?
[female narrator] After their initial review of the crime scene,
detectives have an idea what happened next.
[Greg] It is clear to us it's a blitz attack right there.
It doesn't go upstairs.
It was obvious that she fought for her life
literally in that foyer
and the perpetrator grabbed the barbell
and struck her with it.
And that may have stunned the victim momentarily.
Got her down and then stabbed her.
When we see the wounds, it was almost like an overkill.
She has hair ripped out, there's stab wounds all over her body.
So you're running things through your head like
who could have been this vicious to do this to this woman?
[female narrator] With no immediate suspects, detectives want to know
who the 911 caller was that identified herself
as Anna Lisa's neighbor?
[Greg] We immediately sent down personnel to that payphone
half a mile from the crime scene.
It is a huge lead that there was a actual eyewitness
to at least the beginning of this homicide.
[female narrator] Police process the payphone for prints.
At a restaurant close to the phone,
officers question patrons and staff.
Did anyone see the mystery woman who made the call?
[Greg] Unfortunately, customers were coming and going,
but no one saw anybody on the phone
and there was nothing to gain of evidentiary value
from the phone or the receiver.
[female narrator] While forensics technicians dig deeper
into the crime scene,
Detective Holt has the grim task of notifying the victim's
next of kin.
Mr. and Mrs. Raymundo are obviously
completely stunned.
[female narrator] Detectives learn that Anna Lisa
was a highly accomplished and successful young woman.
[Eve] Anna Lisa was a Harvard graduate.
She went on to get her Master's at Columbia
and then she started her career
in the pharmaceutical business.
Anna Lisa not only was very intelligent,
but was very well liked. She was very athletic.
[Alison] She was a beautiful, stunning woman.
Anybody that spoke about her always spoke about
how nice she was.
That she was bubbly and caring and very involved
with her family and friends.
Mrs. Raymundo, the pleading that was in her eyes,
she was begging us to find out what happened to
their lovely daughter.
[female narrator] To catch Anna Lisa's killer, Detective Holt
must put together the last 24 hours of her life.
[Greg] Anna Lisa had called her mom at 10:34,
the morning of the homicide. Didn't get in touch with her,
but left a voicemail.
That was very instrumental in narrowing that timeline down.
So now we had 10:34 to the time of the 911 call
at approximately 12:00 p.m. as the window
for this homicide occurring.
[female narrator] Anna Lisa's parents report their daughter had been
working at home when the killer struck.
Was this a robbery gone wrong?
Anna Lisa's pocketbook and possessions
was still there.
Didn't appear that anything was missing.
So it didn't look like it was a robbery at that time.
[Greg] There's no evidence that the perpetrator went
any further than that foyer.
This is clearly a targeted attack.
They went to that specific door
and she allowed them into her house.
[female narrator] The question is, who came knocking on Anna Lisa's door?
That evening, Anna Lisa's neighbors start coming home
from work only to find their access blocked
by the crime scene.
It's dark, and a car pulls in.
And a male, white, gets out and he wants to go home
and he is asked, "Where do you live?"
And he points towards our primary crime scene.
He's identified as Nelson Sessler,
boyfriend of the victim, Anna Lisa Raymundo.
So now we know that we have to talk to this dude.
We take him down to the station for what
turns into a marathon interview overnight.
In four out of five murder cases, the suspect and victim
are known to each other.
So in this case, you'd want to examine the intimate partner
because they could be one of the most likely killers.
The interesting thing is Nelson Sessler never asked,
"Why are you at my house? Is Anna Lisa Raymundo okay?
Is everything okay?" All of the standard questions
that a civilian might ask the police,
particularly where they're intimately involved
with somebody at that crime scene.
He was very, not emotional.
He was like, very relaxed, which was very unusual.
Clearly, there was so much more going on that
he isn't being forthright about, and we just had
to figure out what it was.
[female narrator] Hours after the brutal murder
of 32-year-old Anna Lisa Raymundo,
Stamford detectives want to know if her boyfriend
Nelson Sessler is the killer.
Nelson says he wants to cooperate,
but something's off about the way he's behaving.
[Greg] When we've disclosed to him that Anna Lisa was the victim
of a homicide.
There was no demonstrative, "Oh, my gosh, what happened to her?"
No tears, just a deadpan individual.
He was not appearing like he wants to help us
with the investigation.
If we asked him a question, we would get a yes or a no.
Whatever information we are getting from Nelson Sessler,
it's like pulling teeth.
He would not volunteer anything.
[female narrator] Eventually, after hours of interview,
investigators are able to pull some information
out of Nelson.
We learned that he has a residence within the city
of Stamford, but he also resides occasionally
at Anna Lisa's condo.
Nelson was a couple of years older than Anna Lisa.
They had been dating pretty seriously for at least a year.
They were talking about marriage.
[female narrator] Did this young couple's love somehow end in murder?
Investigators know that Anna Lisa was attacked sometime
between 10:34 a.m. and 12:00 noon.
Where was Nelson at that time?
We learned that Nelson had been at her place.
He leaves for work around eight o'clock in the morning
and Anna Lisa is home.
[Greg] Nelson Sessler said he went to his office,
stayed all day, did not leave for lunch,
then at the end of the day, drives home.
If what he has told us is true,
he would have been the last person to see her alive
as he left for work and left her at the house.
He tells us that he works at Purdue Pharma,
which is a gigantic drug company.
We also learned that Anna Lisa Raymundo worked
at Purdue Pharma.
[female narrator] The couple began dating as co-workers.
But recently Anna Lisa moved on to a different company.
Detectives wonder if the move sparked a change
in the relationship?
We asked him, "Are you dating anyone else?
Do you have another girlfriend? Are you married?"
"No, no, no.
Anna Lisa's it. There was no other female involved
in his life."
[female narrator] According to Nelson, Anna Lisa was well liked
and had no enemies at work.
But he was concerned about her behavior at home.
He told Anna Lisa that she shouldn't walk
in front of windows or be careful about somebody
following her.
Just be mindful of your safety.
Somebody might see you parading in front of a window.
[female narrator] Nelson suggests Anna Lisa may have been attacked
by a peeping tom.
But Holt has already examined her condo.
And Nelson's story doesn't ring true.
[Greg] What window are you talking about, Nelson?
Unless you are across the way in another condo
on the second floor. You couldn't see into her unit.
It didn't make any sense.
[female narrator] Holt wonders if Nelson is giving a false lead
to point police in the wrong direction.
[Greg] I knew 100% that Nelson Sessler
was not being truthful with us.
I knew that he was lying to us about something.
I knew that he was withholding information.
I just didn't know what.
[female narrator] If talking to Nelson doesn't reveal the truth,
maybe the physical evidence will.
Detectives know that Anna Lisa put up a big fight.
If Nelson was her attacker, he'd likely have scratches,
cuts and bruises on his body.
[Greg] We had one of our CSIs come in and photograph him
from the waist up without a shirt on front and back,
looking for any wounds, but we didn't see
any scratches on him. We didn't see any marks on him.
There was nothing to indicate that he had been in a fight.
[female narrator] Nelson says he was at work.
So investigators contact security at Purdue Pharma
to check his alibi.
Purdue Pharma has extremely tight security.
Everything is closed circuit television cameras.
You have to swipe a card key wherever you go
within the company.
They pulled up all of their CCTV footage,
and showed him entering the parking garage
that morning. They pulled up all of
the computer records showing that he swiped his way
into the building, entered his office.
And then everywhere that he went within
the Purdue Pharma facility that day, he was card swiping.
He had an ironclad alibi
from the time that he left the homicide location
at approximately 8:00 a.m. until the time that
he returned home in the same clothes that he left in.
[female narrator] There is no way Nelson attacked and killed Anna Lisa.
Holt is suspicious that Nelson is hiding something,
but with no evidence against him,
they have to let Nelson go.
Investigators re-listen to the one piece of evidence
they do have... the recording of the 911 caller.
They need to find the person who claimed to be a neighbor
and a witness to the murder.
[Keira] Typically, when someone's calling from a payphone,
it means that they don't want their own number
or their own phone information to be recorded.
It could also be that they're in close proximity
to the killer and don't want to be overheard making the call
or don't want people to know that they've come forward with information.
[Greg] We had a tape recording of the 911 call
and we had been playing that at Purdue Pharma.
We'd been playing it to folks around the condo
that resided there, thinking maybe it was a housekeeper,
maybe it was a babysitter.
We were including that in our articles
to have this person come forward.
And that did not happen.
We exhausted every single avenue that we could think of
to identify the 911 caller and it was completely
a dead end on all fronts.
[female narrator] Canvassing Anna Lisa's neighborhood doesn't help police
find the 911 caller.
But it does produce a terrifying new lead.
[Greg] An individual had been bragging,
bragging about killing a woman, stabbing a woman with a knife.
It was seen by someone that he had blood on a sneaker.
We are now thinking this could be the perpetrator.
[female narrator] Word on the street is the suspect is part of a gang
of thieves who operate on the waterfront.
Property crimes was investigating boat burglaries
out on the docks.
Boat burglars were stealing high end equipment
off of the yachts ward in the area where Anna Lisa lived.
Because it is an affluent area,
it definitely attracts criminals breaking into homes,
stealing things from boats.
[female narrator] As Stamford Police work to identify the suspect,
they get a call about a suspicious car
seen in the marina on the day of Anna Lisa's murder.
[Greg] There was a black car filled with saltwater fishing gear,
brass instrumentation, probably stolen.
[female narrator] The witness recorded the vehicle's license plate
which police are able to connect to a name.
41-year-old, Gary Riley.
[Greg] Gary Riley was identified.
He has a criminal record and a burglary warrant
that was out on him.
He had been seen on the docks the day of the homicide
between 11:00 a.m. and 12:00 p.m.
[female narrator] Gary Riley is a thief who was seen in the vicinity
at the time of the murder.
Now detectives wonder if he's also a killer.
We had to go out and scoop him up as fast as possible.
[female narrator] Days after the murder of Anna Lisa Raymundo,
Stamford police are looking for the guy who said he did it.
A known criminal named Gary Riley.
We are talking to people that were trying to locate him
and we heard eventually that he will was holed up
in a seedy motel.
That's how he was ultimately located.
We went down to the lockup and brought him up
to the interview room.
He's tweaking constantly because he's either high
or he needs to get high.
[female narrator] It doesn't take long for detectives to figure out
what Gary knows about Anna Lisa's murder.
[Greg] On top of being an obvious liar,
Gary Riley just didn't know any details of it.
Other than what you could have learned on the news,
in the newspaper. The more we talk to him,
the more we are realizing that he is just a braggart.
[female narrator] Incredibly, it seems that Gary was taking credit
on the street for a murder he knows almost nothing about.
Sometimes people want to cultivate a reputation,
so other people in the community are afraid of them.
[Greg] He tries to be bigger than what he actually is
when he's out there down the street.
"Hey, look at me, I killed this person.
I'm a pretty dangerous individual."
Now, these are petty criminals,
and they're not the brightest people on Earth.
[female narrator] Under interrogation, Gary smartens up
and confesses to what he really saw when Anna Lisa was killed.
Riley is telling us that he and his partner
named Matt McCabe are on the docks
burglarizing boats with a black auto filled
with stolen high end equipment.
And they see all of the police activity
and they're thinking, "Oh, my God, somebody spotted us.
They're after us."
So they started fleeing the area.
[female narrator] Gary escapes the scene on foot.
But his partner Matt takes the car.
Matt McCabe took off with that black auto.
Gary Riley never saw the auto again.
Gary Riley is saying, "I didn't do it, but maybe he did it."
Riley turned us on to Matthew McCabe.
[female narrator] Gary Riley is charged with theft,
but he played no part in Anna Lisa's murder.
We were able to conclude that other than being
on the scene between 11:00 am and 12:00 pm
during the commission of both burglaries,
Gary Riley was not involved in our homicide.
[female narrator] Detectives turn their attention to Gary's partner in crime.
Matt McCabe.
Did Matt McCabe attack and kill Anna Lisa Raymundo?
Detectives are wondering if Gary's accomplice Matt
could be the real killer?
No one can be eliminated as a suspect until they find him
and this elusive car.
We're thinking that Matt McCabe may have fled
the jurisdiction after the homicide in that black auto.
[female narrator] After weeks of searching,
investigators find no trace of Matt McCabe
in the vicinity.
Then they get a lucky hit from 1300 miles south
in Fort Lauderdale.
Matt McCabe was arrested in Florida,
not in connection with our homicide at all.
It was burglary, property crimes
and he had ended up being collared
and he was being held on bail.
[female narrator] Detectives immediately traveled to the Fort Lauderdale prison
to question Matt McCabe.
[Greg] We interviewed him at length, he responded to our questions,
he didn't lawyer up.
He clearly admitted to being a burglar.
But he said I didn't have anything to do with this homicide.
I didn't have anything to do with it.
He allowed us to take a buccal swab
and head hair for comparison.
[female narrator] Holt then asks about the black car McCabe used
during his boat heists on the day of Anna Lisa's murder.
[Greg] Matt McCabe told us that he had taken that car
to a salvage yard, wrecking yard.
And we're like, "Well, do you remember where?"
McCabe either can't remember where the vehicle is,
or he doesn't want police to find it.
[Greg] The auto might contain evidence from the homicide
if people that were in that auto had been involved
in the commission of the homicide,
so that's why we wanted to locate it
and see if there was any forensic evidence in it,
namely some blood.
So we go to Fort Lauderdale Police Department,
and we asked them for a list of salvage yards
in their jurisdiction.
We get it and we're starting to canvass these yards,
but we cannot locate the auto.
It was probably scrapped and crushed.
[female narrator] The mysterious black car is never found.
But investigators do return to Stamford with McCabe's DNA
to submit it to their lab for analysis.
Is it a match to the hair and blood found at the crime scene?
[Greg] The Connecticut State Police forensic laboratory
compared the samples that we took from Matt McCabe
against DNA that was collected at the crime scene
and his buccal swab and pair did not match the recovered
forensic evidence at the scene.
[female narrator] Matt McCabe is eliminated as a suspect.
Stamford police are no closer to finding who killed Anna Lisa.
The police were feeling a lot of pressure to solve the case.
The family was calling the newspaper all the time,
they wanted justice for their daughter.
The public wanted to know what was going on.
I definitely think the police had a lot of pressure at that time.
[female narrator] Four and a half months pass after Anna Lisa's murder.
When the case suddenly breaks wide open.
[Greg] I arrive at the squad room.
And there is a female detective Alison Carpentier
from Westchester County, New York Police Department.
[female narrator] Detective Alison Carpentier is a 14-year veteran homicide
detective of the Westchester County Police Department.
[Alison] When I arrived at Stamford Police Department,
I'm introduced to a detective by the name of Greg Holt.
And I said everybody thinks that I should come here
and speak to you guys.
[Greg] I am kind of wondering, "Okay, what's going on?"
[female narrator] Detective Carpentier is working on an attempted murder case
up in New York State that might be connected to someone
in Holt's jurisdiction.
Greg Holt is like why would you think your investigation
is involved with my investigation?
And I tell him that we believe our investigation courses
over to a gentleman named Nelson Sessler.
We believe that Nelson Sessler is involved with this woman
who attempted to kill her husband.
[female narrator] Nelson Sessler was also
Anna Lisa Raymundo's boyfriend.
And I said, "Nelson Sessler. Oh, baby, here we go."
[female narrator] Four and a half months after the murder
of Anna Lisa Raymundo,
Detective Alison Carpentier from upstate New York
tells Connecticut detective Greg Holt to take a second look
at the victim's boyfriend, Nelson Sessler.
He's been linked to an attempted homicide
that happened just two days ago, in neighboring Westchester County.
[Alison] I got a call from my patrol sergeant and tells me that
I need to respond over to a crime scene.
It's in a parking lot.
Upon arriving on our scene, we realize there's a victim,
a male victim named Paul, that is in an ambulance
being rushed in to the emergency room for a major surgery
to save his life.
At the scene itself is a woman.
She's being held by patrolmen.
And we learned that she had just stabbed her husband.
[female narrator] The attacker is 33-year-old Sheila Davalloo.
[Alison] Right after her husband gets out of surgery,
we learn what happened.
Him and his wife were playing a game,
Sheila tells him that it would be fun,
just something to make them be a little closer.
Paul describes to us that their relationship has separated
a little bit and he was spending a lot of time at work.
So he was very into playing this game with his wife.
Sheila describes to him that she'll blindfold him
and then put items up to his chest and he can, you know,
guess what they are.
And she starts to play this game with Paul.
[female narrator] According to Sheila's husband, Paul, the game began
innocently enough.
Then suddenly he feels pain.
Paul feels a very sharp object in his chest.
And he says what was that?
And she's like, "Oh, it was the back of a candle.
It has like a wire on it."
And so he's like, "Oh, alright. I guess it wasn't that bad."
But within minutes, he feels another thrust of the knife
in his chest.
[female narrator] Sheila claims it was an accident.
But then she stabs him again.
Paul's insisting at this point, "Please take me to the hospital.
I'm bleeding. I need help."
[female narrator] Sheila says she's calling for an ambulance,
but they're too busy to respond.
She tells Paul they can't come here.
They're on a lot of emergencies.
[female narrator] Eventually, Paul convinces Sheila to take him to the hospital.
[Alison] Instead of driving him to the emergency room,
she drives him to a wooded area in the back
of the parking lot.
She stabs him again and then she tries to drag him
into the woods. Paul starts screaming, "Help me. Help me."
And then people that are in the parking lot come over
and they were able to help Paul and call for an ambulance.
We bring Sheila Davalloo back to our headquarters.
In the beginning, we let Sheila believe that Paul's injuries
are very severe.
We don't know if he's going to make it, it doesn't look good.
We let her believe that because you want as much lies
as you want truth when you're interviewing somebody.
So Sheila is telling her little tale thinking
we're never going to find out the truth.
She goes into this whole story of how Paul came home injured already
and she rushes to get him some help.
[female narrator] Detective Carpentier knows Sheila's lying,
but she needs hard evidence to hold her in custody.
[Alison] So we start going through Sheila's phone.
And we learned she didn't call 911 from that cell phone
or the home phone, but she does call a person
in her contacts right after she stabs her husband.
Sheila calls Nelson Sessler and makes a date for that night.
[female narrator] Nelson Sessler, Anna Lisa's reticent boyfriend
is now connected to Sheila Davalloo,
who tried to murder her husband.
Detective Carpentier now wants to know if Nelson Sessler
is also involved in that attempted murder.
Me and my partners show up at Nelson Sessla's apartment.
We're knocking on the door, nobody's answering,
so we knock on a neighbor of his,
a gentleman answers the door and I said, "You know,
Nelson Sessla?" He tells me, "Yes."
He goes, "I know what this is about.
This is about his girlfriend that was murdered."
And I said his girlfriend that was murdered?
I don't know anything about that.
He goes, "Well, then I think you need to get your answers
from Stamford police department."
So from Nelson's apartment, we drive over to Stamford Police Department.
[female narrator] At Stamford police station,
the detectives exchange information on their cases.
I asked to see the crime scene photos.
We're going through with them.
When I looked at the crime scene in Stamford,
I remember just saying, "Why is it such a bloodbath?"
Why is their hair pulling? Women pull hair,
we kick, we pull hair. This was a catfight.
[female narrator] Detective Carpentier suspects the attacker might have been
a woman and her suspicions are about to get stronger.
[Alison] They report to me that they have a 911 call
from the day of their homicide.
I said can you do me a favor? Can I hear that 911 tape?
Immediately, because I had just interviewed Sheila
for 12 hours straight,
I said to them, "I believe I know who that caller is."
That person is Sheila Davalloo.
[female narrator] The mysterious 911 caller is suddenly revealed.
Sheila Davalloo.
She just tried to kill her husband.
And now she's placed at a Stamford payphone
less than a mile from Anna Lisa's condo
on the day Anna Lisa was killed.
Sheila Davalloo is now the prime suspect
in the murder of Anna Lisa Raymundo.
I'm thinking to myself, this person could have
actually killed Anna Lisa.
[female narrator] But if it was Sheila, investigators have no idea
what might trigger such a vicious attack.
Is Anna Lisa's boyfriend, Nelson Sessler,
somehow involved?
I said, "Did Nelson ever mention a person
named Sheila or did they come up in your investigation?"
And they didn't know anything about Sheila Davalloo at that time.
Nelson Sessler never mentioned the name of Sheila Davalloo at all.
[Greg] In the hours and hours and hours that we spent with
Nelson Sessler.
He was asked repeatedly, "Are there any other females in your life?"
He never volunteered Sheila Davalloo.
He was lying to us by omission and lying to us directly.
And we wanted to know more about his connection
with Sheila Davalloo.
[female narrator] Investigators bring Sessler in again for questioning.
They want to know about his relationship with Sheila Davalloo.
And this time, they need him to tell the truth.
Are they friends?
Why were you coming over there for dinner?
-[phone ringing] -[Alison] Why does Sheila stab her husband
and then make a call to Nelson? Is he part of it?
[female narrator] Detectives find out there's a surprising connection.
We learned that Nelson Sessler is a colleague of Sheila's.
Sheila works at Purdue also.
Anna Lisa, Nelson Sessler, Sheila Davalloo all work together
at Purdue Pharma.
[Alison] Nelson is telling me that him and Sheila are just friends,
co-workers, they go out for drinks once in a while,
and that since she has these two dogs,
he helps her walk them.
[female narrator] Detective Carpentier doesn't buy it.
I just looked at Nelson in the eye and I said,
"Nelson, we know you're not driving from Connecticut to New York
without getting laid."
And then he finally admits that he's having an affair with Sheila.
The fact that police pointedly questioned Nelson on
who his exes were.
But that Sheila was omitted entirely.
It seems for a reason, as though Nelson perhaps had
some lingering concerns back then
that she has something to do with this murder.
To me, the omission appears deliberate.
[Greg] We did a search warrant on Sheila Davalloo's condo.
We are locating photographs of her and Nelson Sessler.
Tickets for a Giants football game, photograph on a ski trip.
[female narrator] In her bedroom closet,
they find something more sinister.
[Greg] We locate a box that housed night vision goggles,
and now we're thinking could she have been doing
surveillance on Anna Lisa?
That goes back to the comment by Nelson Sessler,
of parading in front of a window that people
might see you.
We're trying to put those two together.
[female narrator] If Sheila was stalking Anna Lisa,
was she acting alone?
Or was Nelson in on it?
[Greg] I wonder if he knows that his girlfriend
is doing surveillance on his girlfriend?
[female narrator] Investigators have discovered that
Anna Lisa Raymundo's boyfriend,
Nelson Sessler had a second relationship
with a married woman, Sheila Davalloo.
Now detectives from two states need to determine
if Sheila and Nelson conspired and executed a plan
to murder Anna Lisa.
[Alison] While we were interviewing Nelson Sessler,
he tells us that a couple years prior at the time
he was also seeing Anna Lisa.
So he's seeing both women at the same time.
He tells us that he felt a more of a connection
with Anna Lisa and that he broke things off with Sheila
and they remained friends.
[female narrator] Nelson insists he was in a monogamous relationship
with Anna Lisa at the time of her murder.
He says that he hadn't seen Sheila and that
he only started sleeping with her again
after Anna Lisa died
because Sheila was a big comfort to him.
[female narrator] Nelson maintains that Sheila told him she was single.
Nelson didn't believe that Sheila was currently married.
Nelson Sessler later said that she was saying that
she was divorced, and she would invite him to dinner
about once a week.
[female narrator] Detectives find Nelson's story hard to believe.
How could he have stayed at Sheila's house
without knowing she was married
and living with her husband?
Remarkably, it's her husband Paul who corroborates Nelson story.
When she would invite Nelson over,
she would clean out any pictures of her husband
and she would tell her husband that she was having
her brother over. Now, her brother had
some mental issues.
Paul said that Sheila used the excuse that
her handicapped brother would be sleeping over.
And he would be upset if he knew Sheila was married.
So Paul thought he was being a good husband
and would spend many nights out of the home.
So Sheila supposedly could have her handicapped brother
sleep over.
We learned that her brother has never stayed in her home
and that those occasions, she was having Nelson sleep over.
"The brother," quote, unquote, was Nelson Sessler.
[female narrator] It appears that Nelson was telling detectives the truth.
Sheila was lying to both her husband Paul and to him.
She was kind of covering all our bases, you know,
like lying to Paul Christos, lying to Nelson Sessler.
And I think at some point, maybe she just couldn't keep up
this whole charade anymore.
[female narrator] Detectives contact security at Purdue Pharma.
This time to track the movements of Sheila Davalloo
on the day Anna Lisa was murdered.
[Greg] We learned that at 10:53 a.m. on the morning of the homicide,
Sheila Davalloo leaves the property of Purdue Pharma.
At 1:53 p.m., Sheila Davalloo reentered the property
of Purdue Pharma and went back to work.
She was on CCTV and she had to use her card
to get to the garage to get her car.
[female narrator] Not only do detectives know that Sheila was out of the office
during the time of the murder,
her cell phone records also reveal where she went.
Sheila Davalloo's cell phone showed that she pinged within
the confines of Stamford, right near Anna Lisa's condo.
[female narrator] The tracking data puts Sheila at the crime scene
at the time of Anna Lisa's murder.
But there's one final piece of evidence against Sheila
that proves the most damning.
[Greg] The drop of blood below the faucet handle
in the powder room at Anna Lisa's condo.
The DNA comes back to Sheila Davalloo.
We knew we had her.
[female narrator] Investigators are finally able to piece together the events
in the final 24 hours that led to Anna Lisa Raymundo's murder.
[Greg] Nelson Sessler had spent the night at Anna Lisa's condo,
they both get up in the morning at eight o'clock,
give or take.
Nelson Sessler subsequently leaves for work
around 8:30. At 10:34 a.m.,
Anna Lisa makes a phone call to her mom,
does not get her mom on the phone,
but leaves a message.
[female narrator] At 10:53 a.m., Sheila Davalloo leaves
the building where she works.
Between 11:00 am and 12:00 pm,
Sheila Davalloo walks up to Anna Lisa's apartment,
knocks on the door and obviously Anna Lisa opens it.
We believe that Sheila took Anna Lisa by surprise,
and that's where the attack starts.
[Greg] At approximately 12:00 pm, Sheila Davalloo makes
a 911 call into the central dispatch center
for the city of Stamford Police Department,
indicating that her friend had been attacked by a male.
At 1:53 pm, Sheila Davalloo reenters her workplace
at Purdue.
At four o'clock while at work, she actually leaves Nelson a voicemail on his phone,
telling him to have a good weekend.
[Greg] Sheila Davalloo killed Anna Lisa Raymundo
because she was interfering with her relationship
with Nelson Sessler.
The only way to get her out of the picture in her mind
was to kill her.
She planned this, she knew what she was going to do.
This is about winning and losing to people like this.
Sheila's ongoing obsession with Nelson,
whereby she is simultaneously fixated on him
and reveres him, and at the same time,
she's prepared to take extreme steps
to make sure she wins.
And she will take and have what she wants.
[female narrator] In the weeks following Anna Lisa's death,
Sheila rekindles the relationship with Nelson,
who has no idea she is Anna Lisa's killer.
I believe Sheila would have gotten away with the murder
of Anna Lisa had she not attempted to kill her husband.
[Greg] Sheila Davalloo was convicted in New York State
for the attempted homicide of her husband.
She was sentenced to 25 years in a New York state prison.
She was convicted as well in the city of Stamford
for the homicide of Anna Lisa Raymundo.
Sentencing for that was 50 years.
So for all intents and purposes,
she has life in prison.
There's no such thing as closure for a homicide victim's family.
It's with them for the rest of their life.
They lost a wonderful human being.
[Alison] Anna Lisa's loss was so sad.
She was so loved by her friends and family.
She had such a bright future, she was just beginning
to come into her own.
Such a life cut so short.
So sad for her whole family.