♪ ♪ ♪ >>> reporter: they took shelley nance's body back to italy, texas, not quite a week after the murdert the family's church. and it seemed like the whole town was there, along with many of shelley's fellow students from the art institute of dallas. >> it's the most horrible thing we've ever been through. >> the day after the funeral, i was ready to kill somebody. >> reporter: the institute held a memorial, too. and it was there shelley's parents met nathan for the first time. >> he come up and wanted to shake my hand and i couldn't do it. i didn't wanna look at him, i didn't wanna touch him because if he had somethin' to do with killin' my shelley i didn't wanna pretend that it was okay. >> reporter: shelley nance was just 20 when she was attacked and killed in her off-campus apartment here in dallas. tiny, quiet, sweet, and defenseless. the last person anyone would want dead, everyone said that. but clearly someone did. the police already had ashley on their list of suspects. >> i've interviewed her. i'm satisfied that i can set her to the side for the time being. she's not going anyw

>>> reporter: a few weeks after the murder of art student shelley nance, the police were waitingy hoped would explain everything -- the dna on that bloody baggie found in nathan's bathroom. >> if it comes back to shelley, we've got a golden ticket. we know who committed -- well, we know one of two people or both committed this murder. it's not by coincidence that this girl ends up dead and her blood ends up in their apartment in the bathroom. daniel killed her, nathan killed her or they both killed her. >> reporter: hope for the investigators -- dread for art student chris phillips. >> i lived with both of them and to think that, you know, i was living with someone that would do this. >> reporter: and then finally, the lab results came in. >> dna confirmed that that blood come from el and then -- then you have to sit back, scratch your head and say, "well, i wonder if both these guys did it?" and then if -- if you go with that theory, what is the motive? robbery? no. rape? no. i mean, how would you get these two people on the same page to kill this young girl? >> reporter: there