detective gaunterman is at the station to meet hansen. she tells him he's facing a laundry list of charges, including attempted first-degree murder. and he's looking at the possibility of more than 50 years behind bars. and she has something else to say. >> you did this to her. >> i didn't do it. >> you did this to her. >> i didn't do that. >> you can deny it all you want, i know it's you now. >> reporter: what eludes prosecutors is a clear motive. the closest they could come up with is that justin's number was found stored on britney's phone. >> even though there weren't any recent calls or texts or anything like that, the theory would have been that justin hansen was essentially stalking britney, even if nobody really knew it. >> reporter: there's no actual evidence to support that theory. justin's mother, doreen shoemaker, is adamant that her son is innocent. what do you make of that one drop of blood? how did it get there? >> i don't know. i do know that they also had dna in the house on both weapons, and it doesn't match justin. >> r