>> this meant all the evidence at what may have been the murder site was compromised. >> somebody's been there, moving things around, and it just makes the investigation a lot more difficult. >> in the meantime, it didn't take long for investigators to eliminate julie's husband as a suspect. >> when he was perfectly willing to take a polygraph examination, kept in contact with the officers trying to work this case, i think all suspicion was erased. >> but julie's autopsy did provide some important information about the killer. the medical examiner found evidence of sexual assault. a rape test kit recovered biological evidence, presumably of the perpetrator. unfortunately, dna testing wasn't yet available. >> crimes in 1985 were a lot harder to solve, just based on technology. there are certain things that we could yield dna profiles from