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Was gonna be called that i couldn't sit in the courtroom during the whole trial. and i'm sorry, i was going to raise a conniption fit because i was going to be there. and the judge decided yeah it would be okay. >> reporter: why call cynthia nance? do you remember that conversation in which shelley told her mother she was thinking of breaking up with nathan? that, said the defense, gave nathan a motive. but certainly not daniel. cynthia was incensed by the questions she was asked. >> for them to call me and ask questions trying to make it sound like that her conversation with me wanting to bre...

Rather weird to begin with, too. she said, "why did this--" >> reporter: and she found this out? >> yeah, she said that's what he told her. said, "well, you're being inconsiderate of his feelings. >> reporter: did she have an opinion about this? >> she just thought it was strange that he'd wanna go out on a date with them. she's like, "you know, if we -- over at his apartment and we'd be, like, playin' videogames or something in nathan's bedroom he'd open the door, and stand there in the doorway watching them," you know. she said, "that-- that-- that's just weird." >> reporter: that is pretty ...

>> reporter: it was one weird triangle. the prosecution argued that daniel felt left out, became increasingly jealous and then angry. and then his anger turned to rage at shelley. >> that's why this whole thing happened. i believe he had hate in his heart for her. >> reporter: but remember, in a court of law, a defendant is innocent until proven guilty. and daniel? >> my mother asked me if i killed shelley. and i told her, "mama, i'm not the one who committed this. i'm not the one who killed her"" >> reporter: coming up, daniel's defense tries a single, bold tactic -- to cast suspicion on nath...

Mode. and it's like, "okay, if it was her, is it gonna be me next?" in fact, in short order, the art institute of dallas moved its students out of the falls -- and into a more secure apartment complex in a safer part of town. but with the investiga just days old, they didn't know what police were thinking. that this was no random crime -- that it was personal, an "inside job," so to speak. they were looking at people close to shelley. someone who had a key. like a boyfriend or a roommate. someone who knew she'd be asleep, and then surprised her, attacked her with a knife. she was small in st...

He was at school when we believe shelley was killed. >> reporter: but daniel? daniel, remember, had given the police a shifting alibi. didn't tell them in his first interview that he stopped by a walmart store to buy hair dye. but, as detectives thought about it, that new little nugget raised more questions. >> i mean this is a young kid not old enough to have to cover, you know, whatever they're covering. i mean he -- his hair looked fine to me. i thought it a little odd. >> reporter: did he actually go to walmart at all that morning? they subpoenaed this walmart surveillance video and sure e...