have was forensic evidence galore. hundreds of items recovered from his van and from hilton's suspected campsites deep in the woods. >> two items here, duct tape with hair and another piece of duct tape or masking tape with hair. >> one of the items was hilton's video camera that was retrieved. he tried to delete. >> i was able to recover those previously deleted files. >> florida department of law eens forcement lab experts had been able to salvage the audio hilton did not want the world to hear. and with good reason. this is gary hilton two days after sheryl dunlap's disappearance singing into the camera microphone and gaving with the dog dandy. ♪ dan, dan, dan, we're doing it, boy ♪ >> it sounded as though he was confessing to the dog. >> i killed her. >> a hushed courtroom listened to the monolog.