>> a shy kid, somewhat introverted. >> but once he opened up the details he revealed would stun investigators. >> what else did he do to her? >> raped her. >> did he tell you that? >> fastbender says dassie described a brutal scene. on that hollywood afternoon his uncle asked him to come over to his trailer. dassie says they each sexually assaulted theresa in avery's bedroom and avery later shot her in the garage and burning her body in the bonfire. and after speaking with dassie fastbender had his team return to the avery property once more, and they found this in his garage, a bullet fragment. and that was missed the first time around? >> well, i guess i could say it was missed. looks like a piece of dirt possibly. >> it was tested?