>> are you able to tell this jury how this woman died? >> no, ma'am. >> not a cause of death, but what the prosecution did have was forensic evidence galore. hundreds of items recovered from his van and from hilton's suspected camp sites deep in the woods. >> two items, duct tape with hair, and another piece of duct tape or masking tape with hair. >> one of the crime scene evidence recovered was a camera. he tried to delete it. >> i was unable to recover the deleted files. >> they 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 cheryl dunlap's disappearance, singing into the camera microphone, and gassing with his dog dandy. >> my dan, dan, dan man. >> it sounded as though he was