were you present when richard schoeck was shot? >> you know, he knows where richard is going to be.h stacey. he is not at home at three, four in the morning the night of the murder. he shows up the next morning, altered his appearance. , so when you put all of that together, yeah, there's a lot of ringing bells there. >> juan reyes insist he was home with this family when richard schoeck was murdered. but, when juan wife backup his alibi when she finds out that he was cheating on her. >> coming up -- >> if she wanted to throw him on the the bus, that was the time. >> she had a great opportunity. >> when dateline continues. did you know, unless you treat dandruff regularly, it will keep coming back. try head & shoulders shampoo. dandruff is caused by irritation to a germ that lives on everyone's scalp. unlike regular shampoo, head & shoulders contains zinc pyrithione, which fights the dandruff-causing germ and helps prevent it from coming back. it's gentle on hair and provides up to 100% dandruff protection, clinically proven. try head & shoulders shampoo and conditioner. for best re