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Started dating albert and sam had another girlfriend, too, they continued to see each other. and daron found evidence that in sam s mind, his relationship with cathy was far from casual. mary gave me a shoe box full of letters that were written between sam and cathy, and the content of these letters showed a very jealous guy. a guy who would get angry any time somebody flirted with cathy. reporter: sam didn t try to hide the fact that he was prone to jealousy. she knows, every time she mentions some guy s name, i get pissed off, okay? reporter: that led the detective to take a fresh look at those bizarre events the week before cathy disappeared when she came home impaired and then had her tires slashed. she never regained full memory of what had happened, but she was able to tell everybody who she had been with that night. reporter: the person cathy had been with that night? sam lopez. ....
Armpit. reporter: did we tell you? no, we didn t tell you. how long had they known that? a couple of months, at least. and they, what, forgot to call? i think the examiner who had been doing it was waiting for additional results and didn t realize that she hadn t notified us. so the idea of touch-dna paid off? it did. reporter: but not quite the way they had all hoped. unbelievable that you would get touch-dna evidence back that long after the fact. right. but bad news, it doesn t have sam lopez s name on it. right. that s right. reporter: so the strongest physical evidence was still against javier. but it was sam who had the motive, and he was the first one going on trial, even without a trace of his dna anywhere. it had taken 13 years to arrest sam lopez, it would take another eight to bring him to trial. and just months before that trial began, matt murphy learned that sam had a new defense ....
Attorney said, police had it all wrong. the detectives made up their mind about who did this murder within hours. we had a bad feeling about you, they said. we re gonna prove it. and they spent the next 21 years, over and over, trying. reporter: the defense argued sam s behavior didn t prove anything. not only was sam in touch with cathy s family the week she disappeared, he also participated in the search, putting up a flyer at his girlfriend s store. and that business about him not showing any emotion in his interview with police? it is very easy to sit back and say, he should have done that. he should answer this way. look, he s stretching. he s yawning. he s reading a coke can. obviously he s a sociopath. where is the evidence? reporter: step back from those supposed tells, the defense said, and you d see the man sitting in that chair was not lying to cover up a murder. ....
Defendant on trial. and it was teacher versus student. sam had been a suspect for 20 years. and during that time, his attorney said, police had it all wrong. could detectives have made up their mind about who did this murder within hours? we had a bad feeling about you, they said. we re going to prove it and they spent the next 21 years over and over trying. the defense argued sam s behavior didn t prove anything. not only was sam in touch with kathy s family the week she disappeared, but he also parted in the search putting up a flyer at his girlfriend s store. and that business about him not showing any emotion in the interview with police? it is very easy to sit back and say, he should have done that. he should have answered this way. look, he s stretching, he son g he syawning, he s reading a coke can. where is the evidence? ....
they had this long, on-again off-again relationship in which what, he couldn t let go of her? or she couldn t let go of him? i i think a lot of it was mutual. reporter: even after cathy started dating albert and sam had another girlfriend too. they continued to see each other. and daron found evidence that in sam s mind, his relationship with cathy was far from casual. mary gave me a shoe box full of letters that were written between sam and cathy, and the content of these letters showed a very jealous guy. a guy who would get angry any time somebody flirted with cathy. reporter: sam didn t try to hide the fact that he was prone to jealousy. she knows, every time she mentions some guy s name, i get pissed off, ok? reporter: that led the detective to take a fresh look at those bizarre events the week before cathy disappeared when she came home impaired and then had her tires slashed. ....