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She would never harm anybody. she was such a sweetheart. >> that's all for this edition of "dateline extra." i'm craig melvin. thank you for watching. for watcg she was a mom looking for her baby, and her baby hadn't come home. >> reporter: cathy's week had been nothing but trouble. >> she couldn't tell me what happened. >> she was so upset. >> reporter: it was about to get much worse. >> my mom would say "if you find the car, you'll find cathy." >> you didn't want it to be dark because you wanted to keep looking. >> she was stabbed multiple times. there was blood within the interior of the ...

The microscopic calling card 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 evidence for touch dna. you optimistic? or are you thinking, shot in the dark? ...

About, are you serious?" >> reporter: remember, cathy was seeing another guy. albert. who, only days later tried to kill himself. tina says cathy thought about sam's proposal all that week. ultimately, cathy decided, says tina, that she was so broken up about albert she was going to tell sam the answer was no. >> she's crying, and then she said, "i'm going to tell him this saturday that i'm not gonna take off with him, that i will not elope." that was wednesday. and then saturday she never came home. >> reporter: sam's admitted jealousy, cathy's doting on albert, a rejected proposal. all of it...

Before he asked them a single question. and when he finally did -- >> so did you -- do you guys know how she was killed? >> uh, yeah, we do. >> reporter: larry noticed a telling statement. >> thought you were never going to ask. >> well, i didn't want --'cause i don't want memories to come back, you know? >> well, that's an interesting statement, "i don't want memories to come back." what memories does he have that he doesn't want to remember? if he's innocent, he has memories of cathy, good times, what they did. >> reporter: people would want those memories to come back. >> yeah. if he had a ...

>> 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 ...