Original subtitles

[dramatic music playing]

[man 1 speaking]

[man 2 speaking]

[man 3 speaking]

[man 4] Being inside of me is like...

The appetite, it's like a wolf that's...

feeling...

the hunger.

Dylon Peterson is letting the operator know

he's killed two people

and he's looking for a response.

Which is often what a person with psychopathy wants.

They've done the act. They want a reaction from somebody else.

And the operator isn't responding to all of his cues

that are designed to elicit maybe some hock, some horror

or something other than what she's doing

and that's why he's irritated.

[narrator] Tonight, this Vancouver family gathers for dinner

but with one less brother at the table.

15 year old Mathew Nagle was the youngest

and the victim of a brutal stabbing.

Police found Nagle and his mom, Sandra Torell, dead inside their home.

Police say 25-year-old Dylon Peterson called 911

and confessed to killing them.

I heard about Dylon.

He was just a guy hard on his luck that needed some help.

And he seemed like a good guy, you know.

[narrator] Peterson went to the culinary institute with their brother Nick.

And after losing his apartment,

Nick invited him to move in with his family.

For two month, he was the perfect houseguest

but on Sunday, they say he became a psychopath.

[Dr. Charles] Dylon said that Nick is his friend,

they were in school together.

But at the core, people with psychopathy

don't connect to other people.

People don't mean something to them as another human being.

They are like objects.

So the person he turned to and asked for help

was out of the house that night.

And then he killed that person's family.

[Dr. Nicole] They thought that they were helping him.

And, in fact, he was just living off of them

until he couldn't anymore.

He couldn't control himself. He couldn't control those impulses.

And something triggered him, to, you know, act on that.

Peterson's painting a picture of himself

as having grown up in a tumultuous childhood.

We know that children who experience adverse childhood events

tend to have a higher likelihood of mental health disorders.

Including anti-social tendencies.

[Dr. Charles] He's pointing something out,

where he doesn't feel his mother recognized what he was experiencing.

He has an ax to grind. He's got feelings about what she didn't do.

And they're still very much alive in is head.

He discloses that when he was 21,

he began to drink alcohol and spiraled into

severe substance abuse.

We know that individuals with psychopathy

tend to seek stimulation

and that can be from driving in a vehicle, really fast,

to using drugs and alcohol.

And, in fact, we know that just a few days before this arrest,

he was arrested for trying to purchase cocaine.

[Dr. Nicole] This is a perfect example

of someone that lives a parasitic lifestyle.

They're living off of others without care or concern.

They're not paying debts, they're not taking responsibility for anything.

And yeah, he's still the victim in this story.

[Dr. Nicole] He's not taking the responsibility

of killing somebody.

He's blaming it on his past

and something inside of him.

Peterson is saying his family has failed him,

the community has failed him,

society has failed him,

and this is what happens now.

The monster comes out. And the monster is doing this.

Displacing the blame.

It's very possible that he's describing this

demon part of him,

so he can leave open the fact

that he might want to plead "Not guilty" by reason of insanity.

Which would mean he would have to have some element

of psychosis or psychotic behavior,

some disconnect from reality.

He seems to feel entitled to

be condescending toward the mother,

be upset about bad grades,

be upset about the way kids are raised today.

He has so much self-inflated worth,

and value in himself, and grandiosity

that he believes he's in a position

to be judging any of these other areas of life.

There was actually some planning, calculating that went to it,

because he had to pretend to fall asleep.

I think he studies...

It's sort of like a-- you know, a reptile studying for prey.

The thoughts on his mind, he stopped saying it, yet...

Then he talks about going into the bathroom.

It's a nice description of what we call depersonalization,

where a person has an altered perspective

of their physical body.

They may feel taller or shorter than they actually are.

And they may feel like they don't quite recognize themselves in the mirror.

And we know that those states are associated with

chemical changes in the brain.

It's an indicator that there's stress going on.

This narrative that Peter's since describing to them

about having a monster inside of him

can be challenging for detectives

because now they're trying to understand

whether or not he has a true mental illness.

"Is he dissociating? Is he psychotic?"

Usually people that have psychosis,

which is a thought disorder,

encompassed by delusions, hallucinations,

disorganized thought process and disorganized behavior.

He doesn't have that.

He is somewhat organized in his behavior

and he is definitely organized in his thought process.

He's telling us exactly what he's doing, in detail.

From A to Z.

[sighs]

If it's overkill, I think we could say he's--

he's delivering rage and anger

that belonged to more than Sandy, that this comes from the past.

So, my assumption is that Sandy represents

whatever feelings he has about Mom.

And she is the target of all that rage.

[Dr. Chriscelyn] Peterson has demonstrated, from time to time,

some self-awareness.

And here, at the end, we see that

he knows he probably should feel bad.

But at the same time,

he's got some impression management he's trying to uphold.

And that is that he's trying to portray himself

as a monster.

It leaves you to believe

that any remorse he might actually display,

is likely to be superficial.

[man] All your demons,

could murder for nothing more than pleasure.

How proud your parents

and your family must be of what you've done?

[sniffs]

I hope you rot in hell.

[narrator] When the judge asked,

Peterson had nothing to say.