the problem was, brenna's alibi was solid. there were plenty of people who could confirm that they had been with her at the time russell douglas was killed. the detective knew he needed a break. and in july 2004, exactly seven months to the day after the murder of russell douglas, he got one. i was actually out canvassing and interviewing again. and i got a phone call that said we had a tip on the russell douglas homicide. josh mankiewicz: plumberg's partner on the investigation, mike beech, took the call. he just said, hey, i'm just calling to see if you have any unsolved homicides from december 2003. and i said, well, yes sir, we actually have two in december of 2003, which one are you referring to? and he says, the guy who got shot in the head. josh mankiewicz: beech says he didn't know if the caller was the killer or someone related to the killer. but he knew he didn't want to lose it. i'm doing everything i can to keep this gentleman on the phone because, at that point, he still hadn't given me his name. josh mankiewicz:

douglas. >> brenna douglas, the dead man's widow. >> on the stand, brenna identified a picture of peggyhey used to cut hair together. in 2003, she said, she rented a house from peggy. >> did you two become close? >> yeah. we'd talk. it was just girl talk stuff. >> did you talk about personal things with her? >> yeah. >> according to brenna, her rocky marriage to russel douglas was among the things she talked to peggy thomas about. >> he had a lot of issues, throwing furniture around and different things and how he treated the kids and i, it just wasn't okay. >> when you and russ went through a separation, is that the sort of thing you might have talked to peggy about? >> that talked to most people about probably too much. >> why did you say that that you talk to people too much. >> are you a person who likes to chat. >> i just chat. >> do you know james huden? >> i met him. >> how is it that you met james huden? >> through peggy. >> it was on that connection to huden and those woman-to-woman conversations between brenna and peggy that the prosecutor based his theory of the murder. brenn