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 confirm it. sam s dna was not found anywhere on cathy or her car and his clothes, the ones he gave voluntarily to police, had no dna of cathy s on them. but that behavior of sam s which bothered cathy s family, also bothered police, and they focused on him. however, when investigators took
that he was with sam, that sam had picked him up at his house in anaheim and driven him to another friend s house in fullerton during the time that we believe cathy was contacted and ultimately murdered. reporter: so if you believe sam s alibi, he couldn t have been the thing that interrupted cathy when she was writing that note. right. reporter: nevertheless, they pressed sam for more details. the clothing you were wearing saturday? 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
8:00. then, shoo shoot, what i d do that day? oh, somebody paged me, i think. oh, i picked my cousin up again. so if we had to contact everyone that you mentioned, you know, you could get the names and addresses, phone numbers. sure. they could confirm where you were on saturday night? reporter: and sure enough, they did. police spoke with javier who corroborated sam s story. javier told investigators that he was with sam, that sam had picked him up at his house in anaheim and driven him to another friend s house in fullerton during the time that we believe cathy was contacted and ultimately murdered. reporter: so if you believe sam s alibi, he couldn t have been the thing that interrupted cathy when she was writing that note. right. reporter: nevertheless, they pressed sam for more details. the clothing you were wearing saturday? i think it was a guess sweatshirt. reporter: sam readily gave
pressed sam for more details. the clothing you were wearing saturday? 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 confirm it. sam s dna was not found anywhere on cathy or her car and his clothes, the ones he gave voluntarily to police, had no dna of cathy s on them. but that behavior of sam s which bothered cathy s family, also bothered police, and they
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 confirm it. sam s dna was not found anywhere on cathy or her car and his clothes, the ones he gave voluntarily to police, had no dna of cathy s on them. but that behavior of sam s which bothered cathy s family, also bothered police, and they focused on him. however, when investigators took