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Homicide unit. >> so i ended up putting in for that job and being selected. >> reporter: it wasn't long before he cracked open the doors that housed the homicide files. >> and i open the cabinet and i see the torrez case. and i remembered the incident with debbie from about a year earlier. so i pulled it out and i started reading just on free time, just reading it a little bit. >> reporter: by then, the cathy torrez case had been cold for a good three years. >> and essentially no work had been done on it for at least the last two years. >> reporter: from the beginning, police had suspected cat...

Hours later, well, then bob moses, he's sitting in the twin peaks on video. okay? we know where he is. we're not sure where all these other people are. >> reporter: if the timeline's wrong, said the defense, the alibis of all the other potential suspects fall apart. the telltale quesadilla was never found. if the killer ate it, presumably his or her dna might be all over that wrapper. >> you could have skin cell dna on that. you could have touch dna and you could have fingerprinting on that. >> reporter: skipper asked the lead detective about that. >> you didn't uh submit that taco bell trash ...

New dna and a new man in the hot seat. >> he sat there and put his fist in front of his mouth to keep himself from talking. for mild-to-moderate eczema, eucrisa can be used almost everywhere on almost everybody. like the fingers of a flight attendant. the side of a super hero. or the leg of a life guard. eucrisa is a prescription ointment that blocks overactive pde4 enzymes within your skin. blocking pde4 is believed to reduce inflammation. and it's steroid free. do not use if you are allergic to eucrisa or its ingredients. allergic reactions may occur at or near the application site. the most...

>> i think it was a guess sweatshirt. >> reporter: sam readily gave those clothes to the police. he let them search his house too. and he willingly gave samples of his hair and blood. but something about sam's behavior the week cathy was missing bothered her family. mary said she'd repeatedly paged sam looking for cathy, but he was slow to respond. he call you back? >> not at first. >> reporter: but eventually he did? >> eventually, yes. >> reporter: and he said what, he hadn't seen her? >> he hadn't seen her. >> reporter: to all appearances, that was true. and the physical evidence seemed to ...

Spatter. but in the years since, analysis became possible for touch-dna, the microscopic calling cards many of us leave behind just by putting our hands on something. if sam and javier did place cathy's body in the car's trunk, maybe, thought larry, there would be touch-dna on her clothes. >> search for dna in the areas that might be grabbed. especially areas that might be grabbed that don't have blood on them, from cathy. >> so you looked, what, on the ankles and under her arms? >> ankles, arms, i think under the legs. sometimes, you know, in the -- >> reporter: daron wyatt send out the evide...