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I felt that i really wanted to do my best in working hard on this case to help catch the individual. >> fortunately for the scientists, it hadn't rained on the cigarette butts and they were able to generate a dna profile and compare it to kathy's rape test kit. >> the person who had smoked the cigarettes was kathy's killer. scientists compared the dna on the cigarettes to the dna on frazer's tooth brush. >> unfortunately the toothbrush contained dna from at least three individuals. once i was able to see that mixture, i saw frazer's dna. of course, i was excited. >> twhaus most important. scie...

>> 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 ...

>> investigators now wanted to test the biological evidence collected from julie's rape test kit to see whether james elmen was her killer, but there was a risk. the test would consume all of the evidence. >> unfortunately, sometimes you have to make a choice. you might have to run the entire bit of sample. but at the time, you're thinking this is the best technology available. >> investigators decided the gamble was worth it. >> they consumed all of the semen that was contained in those slides trying to get results, results that, unfortunately, never showed who the killer was. >> this was a d...

Walsh's hairs. >> and one of those hairs had the potential to be a gold mine of evidence. >> first hair that i glommed and to was probably the largest hair and it had a root. and had a root with some tissue on it. >> dumb luck kept that towel from burning up and burn being the pubic hair with it. >> investigators now had dna evidence from both crime scenes. biological from the rape test kit and the hair from barbara walsh's apartment. scientists compared robert parker's dna to those dna samples. >> robert parker's dna profile was compared to the profile previously generated from the vaginal sw...

Contacted police about his former roommate, bob johnson. >> someone who came forward and claimed that their roommate at that time in '86, johnson, had come home bloodied and said that he had killed somebody. >> johnson's mugshot looked remarkably like the composite drawing of the suspect. he didn't fit the fbi profile, but his background made him a likely suspect. >> his ex-wife told the investigators that mr. johnson had a significant drug problem, and he was conducting those burglaries to help support that habit. >> janet haynes identified johnson in a photo lineup. >> so i'm sure at that po...