devices as low as $49.88 at walmart. >>> reporter: a few weeks after the murder of art student shelley nanceof a everything -- the dna on that >> 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 shelley. 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 was one other possibility -- did daniel frame nathan