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He's the boyfriend," any time you have a stabbing, you immediately look to whoever that person is romantically involved with. >> reporter: so they called in nathan yet again -- tested his answers. >> multiple times. >> ashley, too? >> yes, yes. >> reporter: they finally arrived at the same conclusion the dallas police did -- that neither ashley nor nathan killed shelley. had to be daniel and daniel alone. but making the case in court might not be so easy. >> this is one of those cases where circumstantial is -- is kind. i mean, you had no fingerprints, you had no dna, you had no bloody clothes...

That was my initial opinion. it was later confirmed. >> reporter: yeah. >> why couldn't a woman do this? >> reporter: sure. >> it's her roommate. there's a lot of things happen between roommates that we don't know about. so it very well could have been. >> reporter: sure. what happened, if anything, between these roommates was something detective ellzey was determined to find out. even if he had to get rough. right away, he would become convinced that something just wasn't right between the two girls. >> what else can you say? it's weird. it's not natural. it's not normal. when i book at hilto...

Was the killer out there somewhere? or worse -- even among them? if this could happen to a sweet, quiet homebody like shelley, surely none of them was safe. >> i think a lot of people, immediately after hearing about this, kinda went into this panic 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 investigation just days old, they didn't know what police were thinking. that this was no random crime -- that ...

Welcome back. the shelley nance murder investigation had taken a dramatic turn. while boyfriend nathan was still on the detective's radar he was now taking a hard look at nathan's roommate, daniel william. he admitted he was at shelley's apartment complex the day of the murder, and according to friends he was gel offense the young woman. but did he hate shelley enough to kill her? turns out the killer left behind a crucial clue, and it was about to land that person behind bars. once again keith morris. >> reporter: a few weeks after the murder of art student shelley nance, the police were wait...