>> where'd you go from there? >> from there i went to my girlfriend's store. and i was there till, shoot, till they closed, which was around 8:00, a little bit after 8:00. then let me see, what did i do that day? 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