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Your brains out. >> reporter: mary ann became so enraged, she spat on him. >> you did this in the name of love. >> i didn't kill him. i did not kill him. and i don't know anybody who did. >> i hate you with all the passion i can dig up. >> reporter: mary ann's tirade seemed authentic. of course, the cops weren't sure at least at this point if she knew more than she was saying. did you ever think, mary ann has to have been involved in this somehow? >> i don't think she could have been directly involved. but she could have thrown out some ideas to him and he might have taken them on his own. >> ...

And years passed. the silence continued. gary got married, started his own family. but the loss of his father still haunted him. >> he never got to see me be successful in my career. never got to see me get married. never got to be the grandfather. >> reporter: 17 years went by. 17 awkward christmass. the detective retired. remember that fresh set of eyes he was hoping for? it was 2002 and an aggressive deputy d.a. read about archie mcfarland. >> as soon as i looked at it, i said, this guy is good for this murder. >> reporter: just what police thought at the beginning, of course. difference wa...