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Danielle had some kind of hatred towards sam, that there was -- that she wanted to hurt him. >> reporter: and based on those text messages, it seemed clear to detectives that she had persuaded michael to feel the same way. >> i absolutely think she poisoned michael's mind as far as what sam was. >> everything he knew about sam was that he was a violent person. he was described to him as a drunk, as a cheater, as a liar. that knowledge came from one person and one person alone. it was danielle. >> reporter: did you have any evidence as you kept investigating that sam was abusive or violent towa...

Couldn't even believe that i was doing this. i don't know. i don't know. tell me what is it about me that the church does not like? that seems astonishingly sort of cold blooded and remorseless. >> it was shocking, and these were two of his so-called friends. it's horrific. it's sad. it's horrific. >> reporter: the investigators, of course, wanted to know. what was all this about? what drove dan to do it? >> your motive behind killing sam was? >> money and insanity. >> money and insanity. [ laughter ] i don't know. i don't know why i did it. >> reporter: the centuries-old motive -- money.

Okay? all three are deceptive. >> i know my stories and timelines are kind of juggled up because my mind is not there right now. i'm trying to remember everything i can. i've told you guys everything i know. i'm completely innocent. >> reporter: maybe. now detectives smelled blood. they circled back to that friday, when dan left with sam and came back without him. >> he's gone for three hours, and he comes back having a heart attack. >> yeah. >> we know he's out killing sam at that point. >> i thought he was just overreacting because he thought he was afraid of loan sharks and getting hurt. >>...

>> i said, "lean over. look at it right there." when she was leaned over, i put two bullets in the back of her head. >> reporter: dan admitted scrawling those nasty words on julie's back and to splitting her pants with a pair of scissors. the next day, he said he disposed of sam's body and then gave another pitch-perfect performance captured on videotape. detectives asked why. >> and your motive behind killing sam was? >> money and insanity. >> money and insanity. >> reporter: sam had more than $60,000 in the bank, his saved-up combat pay. and julie kibuishi? dan said he killed her to cover hi...

She did manipulate him. did she manipulate him to the point of killing sam? i don't know. >> reporter: detectives mcdonald and szalbirak realized they needed to pay danielle dreher another visit. >> we're going back to find out what is your intent, what is your involvement in this? >> coming up, did someone have reasons to commit murder? >> it was a substantial amount of money she was going to gain. >> when "dateline" continues. ♪ and add elegance to your home. but quilted northern is not a robe. it's just really nice toilet paper. emreplenished,d, fortified. emerge everyday with emergen-c. ...