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And there was no emotion. >> hal told police he didn't have time to be emotional. he had a farm to run. >> i just did what i needed to do to function and didn't worry about nothing else. >> investigators tracked hal's whereabouts for the day of the murders. fortunately for hal he didn't like to cook for himself so he ate his meals at local restaurants and numerous witnesses provided his alibi. >> people here knew him because i had been to breakfast that morning and that evening for dinner. >> at the autopsies, the medical examiner discovered the sea water had eliminated crucial forensic eviden...

>> hello? genna? >> prosecutors believe doug's impulsive act of violence threatened his career. >> he couldn't risk an allegation that he hit her, struck her, he was working at lawrence livermore lab and he has security clearance so any criminal record would have been difficult for him and put his job in jeopardy. >> with genna unconscious and not sure what to do, prosecutors think doug panicked and strangled her to death. he removed genna's clothing to eliminate possible trace evidence. when doug pushed genna's body into the back seat of his car, he displaced the carpet.

>> very seldom do you have an attack take place with a witness present. attackers in most sexual assaults don't want any other witnesses. z >> a rape test kit collected biological evidence and the results showed it was the same perpetrator in both cases. >> the next morning, investigators found the teenager's car just a few blocks from where vanessa was assaulted. >> we realized he didn't keep the car long. and that the point, we really started focusing in on that he did live in that area and that was his area of comfort where he was acting from just to give him an easy route to get home, wher...

>> his name is scott. >> really. >> he's a senior. >> prosecutors believe doug caught genna on the phone, lost his temper, and struck her. >> hello? genna? >> prosecutors believe doug's impulsive act of violence threatened his career. >> he couldn't risk an allegation that he hit her, struck her, he was working at lawrence livermore lab and he has security clearance so any criminal record would have been difficult for him and put his job in jeopardy. >> with genna unconscious and not sure what to do, prosecutors think doug panicked and strangled her to death. he removed genna's clothing to eli...

Look for traces of flammable liquids. they found none. and chemical tests of the rubble couldn't find accelerants either. >> there was very little trace evidence for us to recover at the scenes. >> there was no vandalism at the fire scenes. so the motive appeared to be thrill seeking and all of the fires started the same way on the ground floor at chest level. over the next several weeks, there were eight church fires, six were lutheran churches. eventually the arsons moved on to businesses and homes. in one night alone, there were 12 different arson fires. all of the fires were set at night w...