Original subtitles

REPORTER: Prosecutors say Kimberly Lynn Cates,

42, a nurse and mother,

died of wounds to her head, torso,

arms, and legs.

Daughter, Jaimie, an 11-year-old

sixth grader, remains in intensive care,

her throat cut, a leg broken.

There are reports she managed to

call 911 after the attack for help.

We just kept saying to ourselves, "Why that,

you know, seemingly unassuming home?"

[theme music playing]

MAN: The thing inside of me, it's like...

the appetite -- it's like a wolf that's...

feeling the hunger.

REPORTER: New Hampshire State Troopers have just arrested

four individuals suspected for

the brutal murder of Kimberly Cates.

Her daughter, Jaimie, remains in critical condition.

Police were allegedly tipped off from multiple witnesses

reporting that four teenagers

were heard bragging about the murder to friends.

The suspects were identified as Steven Spader,

Christopher Gribble, Quinn Glover, and William Marks.

All four suspects are now in custody of the New Hampshire

State Police with charges pending.

Gribble's reaction to investigators,

when he's questioned about this brutal crime,

is inconsistent with how a lot of typical teenage boys

and teenagers would react.

He's very calm, he's very even in his tone.

But what he also is doing is he's impression managing.

He's trying to push a narrative on the investigators

about how he couldn't possibly

be someone that would do this, and that he's this upstanding

member of society.

Individuals, when they want to control the interview

or they want to manipulate the person that's

interviewing them, they'll dance around the question.

It is hypocritical, because just a few minutes ago,

he said, you know, "I'm chivalrous,"

implying, like, "I would be helpful if I could."

But here we see him later in the interview basically not

giving up any information,

being incredibly vague, insincere, and just all around

not helpful.

He's almost challenging them.

"Prove that you have anything on me.

Otherwise, you know, I'm walking out of here."

What the detective is starting to do is confront him,

and some of that is to see if Gribble cracks.

He doesn't show any real stress response.

He starts to laugh almost sarcastically.

This is also where we start to see

more and more of those psychopathic traits

really emerge.

He's not expressing any stress about what they know at all.

What we see is what we would expect to see

with most teenagers -- he's scared, there's not a lot

of energy, and he's somewhat defeated.

But what he is also is cooperative.

The minute you have a crime partner who's willing to talk,

you've got leverage, and most significantly and obviously,

what they now have is a witness.

You almost hear in Marks's account of this

that he's still in disbelief

that his friends really didn't have the same plan in mind.

It wasn't about robbing these two people.

They wanted to kill.

It was maybe indulging in and giving in on a fantasy

and an urge that they had both had for some time.

He is saying, "I'm not using being a sociopath as

an excuse,"

but he does disclose that he had the bad childhood,

which I feel is an excuse or some mitigation.

I think that he's also just grandiose,

and he wants to show them how smart he is.

Look, I have insight into myself.

Here's who I am.

SAHNI: What we know about Gribble

is in 2007, he had been in trouble

for sexually harassing and inappropriately

touching someone.

And in the process, his family took him to see a therapist.

One of the things that emerged was that he was off the scales

high and elevated in the domain that we think of as

sociopathy or psychopathy.

Oftentimes in media, we hear interchangeably

the term psychopath, the term sociopath.

And it's important to realize that for us as

forensic experts, we talk about it as psychopathy,

but they are the same terms.

DET 2: Yeah.

GRIBBLE: Umm...

FOX: Gribble is almost, uh, minimizing his culpability.

He's saying, "I'm not like that.

"I'm a better guy.

I just kill, and I just get it over with."

And it almost sounds like he's trying to juxtapose himself

with a way worse person,

belittling the fact that this was a gruesome,

horrific murder.

He's reliving it almost like somebody would be

feeling joy when they're retelling

about a family vacation.

He clearly enjoyed this, despite the butchery

and just how sadistic and inhumane this was,

and yet he's enjoying it.

And it's clear, as he's telling investigators,

I imagine if we could watch him as he's telling it,

he'd be smiling.

SAHNI: The fact that Gribble's first thought is to go back to

the fantasy of a horror movie

really speaks to the fact that these guys do

not live in reality.

They have really fused what is play-acting and made for TV

and movies and violence that is contrived for entertainment

purposes to that being their script.

Their way of navigating the world is this script

that they have crafted.

These teenagers can't wait to get home

and see whether there's any buzz.

They follow the news closely, they start talking to their

friends about what they did, and that's where we really start to

see the ego and the self-focus that this was a thrill kill.

What is important in this explanation he gives

the detective is while on the surface,

it sounds like there's a little empathy for this

child victim, he then very skillfully and sadly

turns this all back to himself.

And that's where we see the narcissism.

It's now about his own traumatic experiences,

his life as he sees it.

TUSSEY: Individuals with psychopathic traits do seek

stimulation, and they also may get an adrenaline

rush from hurting other people, or, you know,

they get a thrill and a rush out of seeking opportunities

that benefit them.

Had Gribble not gotten caught,

there are so many red flags that this would be

a repeat offense, that he could engage

in this type of behavior again.

SAVOY: Um...

Marks and Glover were attracted to Spader.

They weren't bothered by the idea of doing

a home invasion.

They weren't concerned about their future, and they had

a more antisocial outlook in life -- where Gribble fits into

this is that Gribble and Spader went back to childhood.

Their families went to church together, but somehow, that

disturbed thinking of homicidal urges was the nexus that may

have bonded Spader with Gribble.

TUSSEY: Christopher Gribble and Steven Spader seemed to be

like-minded in some ways,

very interested in looking out for number one,

very interested in achieving whatever they want to achieve,

however they need to do it,

robbing or hurting people if they need to.

So it may be, you know,

in a sense that individuals with similar psychopathic

traits sort of gravitate toward one another.

SAHNI: Once we escalate to trial, and we move forward,

Gribble makes claims that he's insane.

What we see is this complete failure to take responsibility

and a lack of willingness to take responsibility

for his crime.

GRIBBLE: I wanted to get out and have a real social life.

I wanted to torture my mom to death.

I'd get to the point at night where I just really wanted to

sneak in my dad's bedroom,

pull the gun out, and shoot myself in the head,

because I just wanted it to end.

MAN: You actually told Dr. Drukteinis about a month ago

that the people in the jail have no idea how dangerous you are.

No, they don't.

I smile, because it's funny that all

the people in there have no idea who they're messing with.

TUSSEY: So he's talking about wanting the social life

that he was deprived of,

but it's another indication of trying to

reject responsibility, like this wasn't all me.

Look, I'm a product of my environment.

I'm a product of my upbringing.

You know, I think this is performative.

I think he's enjoying being on the stage,

so to speak, of the courtroom.

WOMAN: I could go on for days and days

and days about the depth of your depravity.

But it is sufficient to say that you belong in a cage.