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Sheryl's slashed tire, a tool mark expert said the bayonet recovered on blood mountain in georgia was an exact match to the sharp object that caused the puncture in florida. but the say good night evidence was the dna evidence. joellen brown spent two years testing more than 250 pieces of evidence in the case. brown told the jury she was able >> subjective. it's based on the individual examiner's training and experience. >> the defense was trying to impeach the testimony of the state's expert who said hilton's bayonet had slashed sheryl dunlap's tire, and that was it for the defense. gary hilt...

>> 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 con...

Forensic evidence against gary hilton? >> when the prosecutor present ared the da evidence and the sleeping bag with sheryl dunlap's blood on it and gary michael hilton's blood on it, you could just see the jurors, for them, you saw it in their eyes. they knew. >> and with that, after six days of testimony, the prosecution rested. now the defense, holding a very poor hand, would have to fight for gary hilton's life. its case was brief. lead attorney inez super-called only one witness. an expert on tool mark identification who testified by ♪ if you're looking to save money on your medicare pa...

Yeah, but first i've got to go hide it somewhere else. >> the state's forensic people introduced evidence about sheryl's slashed tire, a tool mark expert said the bayonet recovered on blood mountain in georgia was an exact match to the sharp object that caused the puncture in florida. but the say good night evidence was the dna evidence. joellen brown spent two years testing more than 250 pieces of evidence in the case. brown told the jury she was able to match sheryl dunlap's dna to blood on two of hilton's sleeping bags and on the shoe louis r laces of his hiking boots. >> the major donor ma...

>> a tool mark is a characteristic left behind during the process of using a tool to either cut, grind, file or polish a piece of metal. >> there can be hundreds of microscopic tool marks in a pipe used in a homemade gun. when ballistics experts compared the bullets from the victims to those fired from seda's zip gun, the tool marks were microscopically similar. finally police asked seda for a blood sample for dan testing. dna matched that of the letter from the zodiac killer. detectives had the pleasure of telling seda they knew his true identity. >> i put out my hands and said i've been look...