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[theme music playing]

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[man] The thing
inside of me, it's like...

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the appetite.

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It's like a wolf that's...

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feeling the hunger.

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Technology, technology,
technology.

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What jumped out at
the investigators at that time

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was her SIM card.

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Rohrer's SIM card, or subscriber
identity module, had been taken

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out of her phone and placed
into a phone owned by this man,

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31-year-old Colby Delea Martin.

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[woman] Van Buren County
investigators say

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they found him in
a Wal-Mart parking lot.

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So despite the fact that Martin
has been called back in for

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questioning, he doesn't ask
authorities why he's being

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taken into custody.

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And yet, with a level of
confidence and calm,

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he sits down,
and in this very glib,

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superficially charming way,
he says to the detectives,

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"You tell me your story,
and then we'll talk."

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He's trying to take over
the control of the interview,

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and he's playing it very cool.

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And that level of arrogance
and overconfidence is also

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something we see
in psychopathic

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individuals sometimes.

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So he's been giving
these sort of elliptical,

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partial sentences,
just driving, out of nowhere.

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There's not a full continuity
of ideas going on in the way

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he's communicating.

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And so he's being,
what we say, it's evasion.

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He's not communicating
fully what his memory is

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of something.

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And what we know in research on
verbal evasions, when people

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are lying, is they will use
these little qualifiers like

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just, only -- something happened
and they're not filling it in.

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[officer]
Mm-hmm.

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[officer]
Right.

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What we see sometimes in
psychopathic individuals is

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a very high level
of narcissism.

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And in the case of Martin,
where that narcissism leaks out

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is his own arrogance that
he thought he'd come up with

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this unbelievable story
that's implausible.

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He'd just tell them it was
an accident, and that'd be

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the end of it.

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He didn't even waste the time
or brain power or energy to

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think about, how do I explain
why I moved a body?

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[John]
Colby Martin doesn't feel bad.

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There's no evidence to suggest
that he has any real negative,

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vulnerable feelings at all.

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He puts the tissue up to
his face, but there are

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no tears --
it's presentation.

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It's all theatrics.
It's all drama.

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He's got to get these
investigators on his side.

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Colby is never considering
the victim in this case.

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He's never considering
the husband that had to call

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911 because his wife had just
gone out for a walk like

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she does every day
and never came home.

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[Charles]
I don't think he's worried
about any future suffering on

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the part of his wife
or their kid.

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If he should go to jail,
he's using it as bait.

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It's an emotional lure.

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It's supposed
to get the police to feel

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a little bit more sorry for him.

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It's pure manipulation
on his part.

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He presents it as if he doesn't
even know what a SIM card

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actually is, but then later in
the sequence, we see, well,

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"I don't even have the push
button to get," so he knows what

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a SIM card actually is.

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This is part of the narrative
that he hadn't considered

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because it really doesn't make
any sense why he would have

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this SIM card.

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So he's trying to send up
a test balloon to figure out,

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can he get information from
them in order to establish

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the new lie
that he needs to tell?

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[officer]
Yeah.

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What we'd see potentially is
somebody that in a very

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manipulative and calculated way
is trying to manage

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the impression
of the detectives.

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That if he looks like he has
insight, if he looks like he's

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acknowledging that this doesn't
look good for him and that it

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makes him look like a disturbed
human being, maybe they will

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appreciate the parts of him
that have been cooperative.

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And he goes from that extreme
of saying, "No, I didn't,"

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to, "Yes, I did,"
about washing the car.

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I think it's overall perhaps
designed to elicit kind of

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a frustrated response
from the police.

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Like, would you finally just
tell us the truth?

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Like, this is getting old.
But they never take the bait.

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I think it's a really telling
line when he goes, "I wouldn't

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want anyone to think
that I did it on purpose."

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It doesn't mean that he didn't
do it on purpose.

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He's just saying, "I don't want
people to think

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I did it on purpose."

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And it's a line used to
manipulate the police.

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Instead of just coming clean
and doing the right thing,

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Martin now turns the tables on
the detectives

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and says
that they're playing him.

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We see this with psychopathic
individuals, that part of

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the smoke and mirrors tactic of
trying to evade detection

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or evade responsibility is
to put it on everybody else.

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Sometimes
they blame the victim.

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Sometimes
they blame the system.

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They suggest that evidence
has been planted on them,

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making outlandish and wild
accusations that make

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absolutely no sense.

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It's the first time
his face looks like
it has a real expression.

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He looks annoyed.

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And I think that's because
he did have sex with her.

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So he is one of those people
who would have sex

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with someone
who is dead.

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But it's not part
of his narrative.

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And we know that people with
psychopathy have feelings that

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can be really powerfully
enraged, angry, and violent.

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When investigators looked at
his phone, they found very

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curious and concerning search
engine pornography searches.

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These kinds of things all
suggest someone who has a very,

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very deviant fantasy,
sexual contact with

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a dead body.

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There's only so much that
a fantasy can take before

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you have to know what
that actually feels like.

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So now he decides that
it's time to engage in the act.

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My prayer is that
the monster ball that brought

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a wrecking ball to
my amazing family

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will never
see freedom again.

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I watched for almost two years
an individual who showed

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no emotion, compassion,
or remorse to taking

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someone's life.

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It's never given me joy to
impose a sentence of life in

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prison without even
the possibility of parole.

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But in this case, it does give
me an extraordinary sense

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of relief.

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We didn't raise you
to be this kind of person.

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Every parent's worst fear
would before for their child

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to turn into
a depraved killer.