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started yelling, shelley shelley. >> a young art student murdered. >> she said, your daughter as been found in blood. and then the phone went dead. >> this was brutal and sad. >> the clever killer leaves a blank canvas that had no fingerprints, no dna. >> yeah. >> police zero in on three fellow students. the dead girls friend. >> trying to corner in the hallways at school, texting her on the phone, -- >> her boyfriend -- >> he had daggers, knives, sorts, who collects that kind of stuff? >> and her roommate. >> it felt like a leopard with. you >> absolutely. >> you could have been tha...

Nathan and could have been a random person. and that by the time states is done with its case you won't be able to know who did the crime, they just don't have evidence. it's a pretty good strategy. >> yes. >> it's the only strategy. this wasn't a self-defense case. and it was an insanity case. >> no. >> it had to be somebody else. >> make sense, again did he have blood, no, dna? no. >> what they had in their pocket, my star witness is the boyfriend who we knew the girlfriend was thinking about breaking up with who happened to be obsessed with knives -- >> and oh, by the way he is appearing on...

Was his right, declined to testify when he went on trial for killing shelley nance. so he did not himself point at nathan and accuse him of committing the murder. but of course he didn't have to. his attorney did it for him. it was not a surprise to prosecutor dewey mitchell. >> they said it could've been nathan, and it could've been a random person, and that by the time the state's done with its case, you're not gonna be able to know who did this crime. they just don't have evidence. i think it was a pretty good strategy. >> reporter: yeah. >> i think it was the only strategy. you know, this ...

You know, this wasn't a self-defense case and it wasn't an insanity case. so it had to be somebody else. >> reporter: well, it makes sense. i mean, again, did you have blood? no. do you have dna? no. >> what they had in their pocket, my star witness is, is the boyfriend who we -- we knew the girlfriend was thinking about breaking up with, who happens to be obsessed with knives. >> reporter: and oh, by the way, he's appearing online in a ninja costume, for heaven's sake. >> when he was cross-examined by the defense, they just left the picture of him with the mask on up on the screen. >> reporte...

Reporter: daniel willyam, as was his right, declined to testify when he went on trial for killing shelley nance. so he did not himself point at nathan and accuse him of committing the murder. but of course he didn't have to. his attorney did it for him. it was not a surprise to prosecutor dewey mitchell. >> they said it could've been nathan, and it could've been a random person, and that by the time the state's done with its case, you're not gonna be able to know who did this crime. they just don't have evidence. i think it was a pretty good strategy. >> reporter: yeah. >> i think it was the o...