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"i did not kill cathy torrez." >> he says, "i don't know who did." "that's not what i asked, javier. did you kill cathy torrez?" "i don't know who did." and we play that several times to where he'd finally say, "i didn't do it." "you didn't do what, javier?" "i didn't do what you say i did." >> reporter: can't say the words, "killed cathy"? >> correct. then it moved to, "did you put cathy's body in the trunk of the car?" "i don't know who did." finally he sat there and he put his fist in front of his mouth to keep himself from talking. >> reporter: but javier had already managed to talk his wa...

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 confirm it. sam's dna was not found anywhere on cathy or her car and...

Why not grab javier up that day and say, "okay, your dna and fingerprints were at the scene. we didn't know that until just now. you're going away for murder unless you start talking"? >> well, let's say that we did that and we bring him in and he says, well, yes, my fingerprint was there because i helped her push her car out of the street a week before. or when i was helping her change a tire. i cut my finger and i bled on it. >> reporter: so instead of approaching javier, daron wyatt spent nearly five months carefully watching him and sam. he learned the two cousins were unusually close. >> ...

Weed? but. >> there was no indication that any of that was true. >> which calls into question his story. >> it does. as detective digs deeper into the case. he spots some telling behavior from sam in those old interview tapes. coming up. >> he never shows any emotion about the fact this girl is brutally murdered. no emotion whatsoever. >> that's a big red flag. >> huge. >> he learns that kathy and sam's relationship was anything but straightforward. when the promise continues. julie! hey... guess what day it is?? ah come on, i know you can hear me. mike mike mike...mike what day is it mi...

>> reporter: people would want those memories to come back. >> yeah. if he had a memory that he killed her, that certainly is a memory he doesn't want to relive. >> reporter: after listening to the interviews time and again, the evidence whisperer had no doubt sam killed cathy. but could the team prove it beyond a reasonable doubt? >> ultimately in cold case murders, time becomes one of our friends, because technology changes. >> reporter: at the time of the murder, dna tests could only be done on big samples like blood spatter. but in the years since, analysis became possible for touch-dna, t...