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[reporter] A Bradenton mother
and her infant son

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were found dead at a house fire,

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but, according to investigators,

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the two did not die
in that fire --

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they were killed.

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[reporter
A firefighter heading into work
spotted the fire

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and found
18-year-old Diamond Shelman

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as well as the baby inside.

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[ominous music playing]

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[voice breaking]
She was so sweet.

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I don't see how... [sobs]

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...God could let something
like this happen to her.

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[ominous music builds
and stops abruptly]

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[unsettling piano strokes]

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[typewriter clicking]

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[theme music playing]

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I would kill again.

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They're dead, I'm alive.

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I don't think it was wrong.

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

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

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feeling...
the hunger.

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[suspenseful music playing]

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[suspenseful music continues]

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[Dr. Johnston] I think
Larry Williams is somebody

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who thinks he's
the smartest person in the room.

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I think he thinks of himself
as being pretty smooth.

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He's got two, um, women

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who have children close
to the same age by him.

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He's living with one girlfriend.

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We know that Larry Williams
has had a criminal record.

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He was accused of initiating
sexual contact with individuals

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who were under the age of 12.

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So it really is remarkable
how calm he is

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and how there's such a lack
of anxiety when he's in the room

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with these two
seasoned detectives.

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His lack of anxiety, I think,
is partly his confidence

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that he can handle
whatever is coming up.

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[unsettling tones playing]

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[unsettling music continues]

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[Dr. Sahni]
At this point, the detectives

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are giving William
some indication

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that they know
he's not being truthful.

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Like many psychopathic
individuals,

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there's an active
sort of exchange

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that goes on
with law enforcement

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where they're always engaging
in this impression management,

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trying to advance their
own narrative

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for detectives.

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Williams is already out
of the gate trying to control

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the narrative
of what's happened.

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He's trying to preemptively
direct detectives to look here

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and not look there.

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Look at this other person
she was just starting to date.

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Maybe that's the person
who hurt her.

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That's the last person
who was with her.

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[eerie music playing]

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[Dr. Vienna]
He says, "I did love her."

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He sort of slips up and puts
that in the past tense.

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And then,
when he catches himself,

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he brings it back
to the current tense.

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And that all there just
highlights

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his unsophisticated approach
to this interview.

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He's not really thinking
ten steps ahead.

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He's just trying
to get by and be cool,

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calm, and collected.

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But he's really just
this unsophisticated individual.

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[eerie music builds]

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[tense music playing]

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[suspenseful tones playing]

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[suspenseful music builds]

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[Dr. Sahni]
The thing that's interesting

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about Williams
is that he never shows

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any outward signs of stress.

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Many people in this situation
would suddenly become aware

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that they're under suspicion
for some serious crime.

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They've brought a dog in
who picks up on accelerants,

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and the dog hits on Williams,
not once, but twice.

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But Williams
doesn't miss a beat.

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He doesn't seem surprised.

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He just quickly
explains it away.

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He stays in control
of the situation.

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He just gives them
an explanation and moves on.

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Williams is someone
who's pretty comfortable lying.

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He's comfortable not telling
the truth,

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and he's not concerned
about being found out.

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He just has what seem to him
to be reasonable explanations

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for everything
that's about to unfold.

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Now he's ratcheted up his story,

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and he's wanting
the detectives to believe

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that there's a demon
that's inside of him.

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"I see things, I hear things
other people don't.

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It doesn't normally cause me
stress, I just ignore it."

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And yet, on that day,

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it was someone that was trying
to hold him down

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and scare him, and control him.

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It was trying to get inside him,

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and it may have been responsible

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for whatever bloody, awful,
violent stuff happened

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in that apartment.
It just doesn't add up.

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Williams is a seasoned criminal,

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but he's not a seasoned
mental health patient.

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He doesn't yet understand
the inconsistencies

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in the story he's offering
and why it's implausible.

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And the detectives
capitalize on that.

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They join him
in his delusional statements,

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and they join him
in this explanations,

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and they want him
to now tell them,

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what is it that the demon did?

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[spooky, tense music playing]

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Williams is losing control
of the situation.

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He's losing control
of the narrative

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and of the interview.

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And while, at this point,
most psychopathic individuals

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want to maintain control,
what we see is Williams

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is just --
this fishtail is growing.

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Now we have not one demon,
but we have two demons,

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and they're battling it out
for what the role is

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that they're each gonna have
in this crime,

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and it's becoming
more and more implausible.

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His narcissism is starting
to get the best of him.

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Because the detectives
are joining him in this story,

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and they're showing him
what he believes is empathy

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and kindness and understanding

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that he has
these mental health issues,

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he just gets overconfident
and starts spinning this story

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that now spins out of control.

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[ominous music playing]

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No, I'm not buying
his emotions here.

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I mean,
this is somebody who knows

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what has happened to his son.

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And I think the fact that he
puts his head in his hand

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and kind of looks down is
something I see so often

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when people -- they don't have
the genuine emotions,

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but they -- they know
that they're expected.

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When we look at psychopathy --

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I think that most psychopaths
do have emotions,

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but they're always
related to themselves --

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they feel pleasure,

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they feel anger,
they feel frustration,

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It's all about them.

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Where, when you're talking
about emotions

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toward other people,

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like empathy, like guilt,
like remorse...

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they're absent.

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And so he's got to figure out
how he should be acting,

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and then try to do that.

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[suspenseful rumble]

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[Dr. Vienna] Williams goes
into now yet another variable

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of his story
in that he was going to die.

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Him and Diamond were going to,
you know, kill themselves

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and he was supposed to die,
but for some reason he lived.

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It's just getting ridiculous.

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I think he might even
be telling these wild stories

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to see if he can confuse police.

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[Dr. Sahni] "Malingering"
is oftentimes a term

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that we as forensic
experts talk about

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when somebody is lying

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or fabricating information
or feigning symptoms

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to try and present their reality

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as something different
than it is.

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While malingering
is not an actual diagnosis,

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you're always assessing

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for whether there is
a motive to fabricate.

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And in the case of Williams,
the motivation is very obvious.

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He doesn't want to go to prison
for killing two people.

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He doesn't want to be seen
as somebody who left his son

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in a home that was on fire
to basically burn in the fire

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and suffocate
from smoke inhalation.

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[dissonant music playing]

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[ominous music playing]

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[music continues to build]

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She's providing some more
of the backstory here,

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the true backstory --
he was jealous,

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he wanted control over her.

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For psychopaths like Williams,

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for their significant other
or former significant other,

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moving on to someone else

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is sort of like a wound
to their ego,

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and it also is a sense
of a loss of control

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and power over that person.

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They can't use them and get
what they want out of them

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because somebody else has them.

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That provides a realistic
picture of why Williams

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might have murdered Diamond.

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[ominous music playing]

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When we talk about psychopaths
and their children,

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you know, there's
a lot of research to suggest

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that the attachment,

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if there is one,
and sometimes there's not,

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is very shallow.

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This is a person or a child
who's expendable

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if it comes
to protecting myself.

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So it's this lack
of genuine attachment.

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But when push comes to shove,

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Williams will do anything
to protect himself,

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including murdering his son.

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[unsettling tones playing]

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[Dr. Vienna] The pattern
that you see with Larry Williams

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is one of self-preservation.
It's all about him.

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He's very, very selfish.

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We know that he has several
psychopathic tendencies

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and traits,
such as being manipulative,

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deceitful, pathological lying,

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callousness,
even superficial charm.

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These traits combined
with his narcissistic tendencies

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is what drives his violence.

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All of that speaks to

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someone that has this deeply
ingrained dysfunctional pattern

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of behavioral and cognitive
and personality traits,

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which is essentially
a psychopath.

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[eerie music fades]