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And he had been beaten in the head with rocks. Narrator Jays Body was located about 70 miles away from where tanya was found. Hed been strangled. The boy who found my Brothers Body was 24 at the time. Hes now in his 50s, and he remembers it and has carried it with him this whole time. Narrator the Plastic Zip ties found with both victims indicated this was not a haphazard, spurofthemoment attack. This was something that appeared to have been premeditated. This person came equipped to commit this crime. Narrator who would do this . Jay and tanya appear to have been targeted, but they didnt know...

Dozens of plastic zip ties, presumably used to bind both victims, and among the various items of tanyas clothing, one item stood out. Scharf they found tanyas pants, which eventually were found to have semen on the pant leg. Narrator they also took swabs from Tanyas Body during her autopsy. And so they kept some of the vaginal swabs, and they retained them, frozen, in the laboratory. Narrator but this was 1987, and Dna Science was in its infancy. In fact, the Firstever Conviction using Dna Evidence happened in england just weeks before jay and tanyas murders. Collins when these murders happene...

The pelosi home was also equipped with a private security system, sources say, but it's not clear if the alarm from that system went off. >> there was no capitol police. there was no private security present at the time. >> reporter: this, as the san francisco d.a.'s office reveals chilling new information about the assault. >> this was a targeted attack. this was not a random residential burglary. >> reporter: writing in a court filing, when david depape allegedly "startled mr. pelosi awake," he allegedly had "a large hammer in his right hand and several white, plastic zip ties in his left ha...

The other in the backyard. dna from the saliva on two of the cigarette butts matched the dna from the blood on the stairs. it also matched dna from skin cells on the rubber band holding the plastic zip ties. the dna profile was entered into a national database of 4 million known offenders. there was no match. again, police had to consider the unthinkable, that they were dealing with a serial killer who had successfully eluded them. >> that's the worst kind of crime to try to investigate, because there's no known link to the girls. and so, then you have a larger pool of potential suspects, obvi...

The other in the back yard. dna from the saliva on two of the cigarette butts matched the dna from the bloods on the stairs. it also matched dna from skin cells on the rubber band holding the plastic zip ties. the dna profile was entered into a national database of 4 million known offenders. there was no match, again, police had to consider the unthinkable, that they were dealing with a serial killer who had successfully eluded them. >> that's the worst kind of crime to try to investigate, because there's no known link to the girls. then you have a larger pool of potential suspects, obviously....