wrong. sherri s bmw was gone, a present from john. there was no sign of the weapon, but detectives recovered t two .38-caliber slugs. and there was something else that caught detectives attention. on the inside of her left arm they found a bite mark. a crime scene analyst at the time went ahead and swabbed the mark for any possible saliva that could possibly belong to the killer. saliva that would contain dna from whoever bit sherri. remember, this was 1986. years before dna testing technology would arrive which could link a suspect to a sample like this one. so back then the dna wasn t much help. but the swab was carefully packaged and bundled with all the other evidence. for now, detectives didn t have much else to work with. no eyewitnesses, no usable fingerprints, no clear motive except the theory that this was