how did you hate that girl so much? i didn t you hated her enough to kill her? over a dude? i didn t you hated her that much, that she took nathan away from you, that much, that she caused you so much problems in your personal relationship, that the only answer was to kill her. that s it? reporter: two days after that interview, it was, once again, ashley s turn to talk. and she also revealed something she had not said before. remember, it was quite apparent that whoever killed shelley must have had a key to her apartment. there was no sign of forced entry. well, now ashley told the detectives that a month before the murder, daniel borrowed her car. which would have been neither here nor there, except the key to her apartment was attached to her car keys. you know if he made a copy of it? no, but now that my it s a possibility that he it s the only time i remember i ever loaned my keys to somebody. because i always have my keys.
just the two of them. a road trip to yellowstone national park, more than 1,400 miles up the interstate from italy. cynthia was texting that on her phone, you know, we re leaving texas now. and she sent it to each one of the girls. rachel and shauna responded almost immediately. and no no word from shelley. and we thought, well, she s probably still asleep, you know, cause she didn t have class today. so that wasn t really unusual at the time. it wasn t till later in the evening that we thought something might be wrong cause we hadn t heard from her, and that wasn t like her at all. reporter: what s that like? it s torture. she had a premonition that something was wrong. but i what would happen to shelley? she never goes anywhere. she stays in her room. she only goes out when she has to. reporter: yeah. so the next morning, when she still hadn t called, that s when we both got worried.
about something shelley told her mom that daniel kept trying to corner her, speak to her alone. that it bothered her. his reply he did approach shelly, but only out of concern for nathan. i was actually asking her, i was like, is there something wrong because he s literally failing his classes. so you, as his big brother, mother figure, whatever it was, felt a responsibility for him? and it was because of his obsession with shelley? i believe so. did she tell you to lay off? no, no. she actually thanked me for bringing up the issue and then that s where i left it. reporter: of course, it was quite easy for us to check his claim that nathan was faying his classes. was he? no. but, listen now to daniel s central claim that for evidence of who killed shelley, one need look no farther than that plastic baggie stained with her blood, and found in nathan s bathroom. daniel swore he didn t put it
reporter: so somebody she knew. and from the looks of it the wild, repeated, ferocious stabbing somebody consumed by an uncontrollable rage. but aside from all the blood, they found no useful fingerprints, and, eventually, no dna to help them either. whoever did this had managed to erase any sign of who he or she was. except there was one tiny bit of well, was it evidence, what was it? they found it under shelley s left wrist. a little bitty tiny sliver of plastic. about this long. and probably a quarter of an inch in width. reporter: hmm. any idea what it was when you found it? it wasn t confirmed until after the completion of the autopsy of what the material actually was, that it was latex, a latex material.
nathan and less on daniel. reporter: so did that work out for them? or did it backfire? it didn t work out because shelley s mother also testified when she was cross-examined by the prosecution that as far as she knew, shelley never had that conversation with nathan. so nathan reporter: nathan wouldn t have known. he wouldn t have known. so that kinda kills the idea that that could have been motive if he didn t even know that they were gonna break up. reporter: still, one way or another, nathan may have felt he was on trial as much as daniel was. so in their closing argument, the prosecutors had to essentially act as nathan s defense attorneys. reporter: one of the prosecutors pointed at him and