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>> reporter: conrad's sister colette couldn't believe it when her brother first introduced heidy to the family. >> i was actually really sort of surprised when i first met her, like how did he hand that girl? they just seemed to be such a great match. >> reporter: you saw love and chemistry there? >> oh, it was almost awkward. they were definitely an enviable couple. >> reporter: another year later came the wedding. >> it was amazing. we went up on a lift, a chair lift, then all of the guests left down these slides. so it was just so them. they said their vows, and he's kind of doing this cham...

>> did heidi not know her father or who he was, did that make her depressed or sad? >> no. >> conrad insisted heidi would never commit suicide. >> i think something shot her or something because she would never shoot herself. she would never shoot herself. >> taylor argued it was only after suspicion against conrad had mounted that he changed his tune. >> nobody can identify a shooter based on the results of this test. that is major limitation of this test. >> the defense attorney $ answed saying conrad had pleaded with police to confirm he had no

>> reporter: conrad's sister colette was thinking the same thing as she raced to the hospital. what kind of condition was your brother in then? >> he was just a total wreck, just absolutely hysterical. didn't know how it could have happened. >> reporter: no one did. but back at the truman home, sergeant crook had started analyzing the evidence and was already developing a theory. >> i thought, oh, man, there's something going on here. >> reporter: you got a feeling? >> i got a feeling, yes. it wasn't just me. everybody was kind of looking around like there's something wrong here. we need a det...

Hallway. >> reporter: what did you think? >> i thought she was cute, and i noticed her hard hat, and they have a little personality or stickers, you know. and hers said, it's all about me. deal with it. i was kind of thinking this girl's kind of a feisty girl. >> i want to try it again. >> reporter: soon conrad asked heidy out on a date. >> i'm not that type usually. i don't get superserious right off the bat, but it was almost like we were inseparable after that. >> reporter: that first night? >> yeah, yeah. >> reporter: this tough girl even shared conrad's interest in guns. >> we would go to...

About their experience with conrad. >> everyone felt his behavior was odd. >> he's yelling, but it's a violent yelling. he's like, if you don't save her, i'm going to [ bleep ] kill you. >> reporter: crook found those threats so alarming, he took out his phone to record them. >> you're gonna [ bleep ] die and everyone in your life is going to die if she dies. >> it could be the way this guy reacts to trauma, but i'm telling you it was a red flag at the time. >> reporter: also a red flag conrad was drunk. he admitted he and heidy had been drinking earlier that night. >> i could see in his eyes,...