had been exposed to the elements he thought for at least a week or more. >> 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 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 crime scene techs recovered was hilton's video camera. he had tried to delete the images on it. >> i was able to recover those previously deleted files. >> florida department of law enforcement 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 cheryl dunlap's disappearance singing into the camera microphone and gassing with his dog dandy. ♪ dan, dan, dan, we're doing it, boy ♪