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>> 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. the underside of the carpet and the se...

Trace evidence whatsoever. not a hair not a fiber. dna finger print, nothing. takes three cell phones. how is the kidnaper supposed to get a hold of the people that he wants money from or to tell them he has the baby? why did he take the cell phones. he didn't. that was her way of showing there was somebody else in the house. >> thank you so much for being with us tonight. >> thank you. >> this past november marked 4 years since baby lisa was born. deborah and jeremy join me to talk about what life is like now without their daughter.

Daughter. >> the offensive thing about stereotypes, i think most people would agree, is that they're oftentimes true. but i will say that one stereotype that i think gary ackley is a perfect example of is a domestically violent woman-abusing killer. >> prosecutors believe ackley had access to arlene's apartment key and used it to enter her home late one night after she was in bed. the autopsy results aren't clear about how he killed arlene, but the evidence suggests she was killed while in bed. metal fragments dropped from ackley's clothes on to the sheets, fragments he couldn't see. he stayed...

They learned that smithart's mother, lucille, had gone shopping at the copper river grocery store on the day of the mandy's disappearance and paid for the items with a check. >> the time and date on the register tape was the same. and the time was 3:17, when lucy said that she was home with her son. and she wasn't home. she was at the grocery store buying groceries at that time. >> 200 miles away in anchorage, criminalists used a gel adhesive tape to gather any trace evidence left behind by the killer. the tape lifts the evidence, but the adhesive isn't so strong that the trace elements can't ...

Her, then fled the scene without leaving any trace evidence. he also claimed the killer hid the murder weapon and gloves in the hidden compartment of his truck. >> he talked about the fact that he loved his wife, that he would not do this to her, that she had just given birth to his child so there was no reason whatsoever. >> his story was difficult to believe, but would forensic science provide the answers? >> the bloody hammer found in mike's truck was the first thing analysts tested. >> and that is where i developed a dna profile from. that dna profile matched that of effie ratley. >> the m...