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>> one and a half, meaning not honest at all. that's correct. >> reporter: george's attorney was itching to cross-examine the habitual liar who'd condemned his client. which presented the prosecutors with a dilemma -- the man at the center of their case against george might just destroy it. >> he could be a real problem. >> he could be a real problem. and there was a substantial amount of discussion between pam and i over whether or not we're calling him or not. >> does that imply that you disagreed? >> oh, yes, we disagreed. >> coming up, a risky decision looks like it might just backfire. >>...

Some of her personal items found outside the house. what might they reveal about the killer? >> what crosses your mind when you realize it's somebody walking away from the scene discarding things? it's something a stranger does or a predator. >> absolutely, a predator, sexual predator. >> when "dateline extra" continues. ♪ i tried hard to quit smoking. ♪ but when we brought our daughter home that was it. ♪ now i have nicoderm cq. the nicoderm cq patch with unique extended release technology helps prevent your urge to smoke all day. it's the best thing that ever happened to me. can you sa...

Welcome back to "dateline extra." i'm tamron hall. noel stevens murdered shauna. he admitted it. but he also claimed he was told to do it by her husband, george tiaffay. prosecutors had a tough decision to make, and the case hinged on the outcome. here's keith morrison with the conclusion of "under a full moon." reporter: prosecutors marc digiacomo and pam weckerly had a big problem, and they knew it. the problem had a name. noel stevens. greyhound. >> noel is a very important piece of information, but he's also the biggest risk. >> reporter: in the credibility sweepstakes, he's way down her...

Welcome back to "dateline extra." i'm tamron hall. to detectives investigating shauna's murder, something just wasn't right with what her husband george was telling them. especially about how well he knew the homeless handyman who they believed killed shauna. but now they wondered, could george have also played a role in her death? here's keith morrison again with "under a full moon." >> reporter: it's an old police tactic to stimulate -- maybe upset -- a suspect you haven't quite cornered, hoping for an overreaction. sometimes it works, sometimes not. so even though they didn't have a solid c...

Victory and also criticized the immediate i donmedia for the co campaign. he says it's now time to get to work rebuilding america. back to dateline extra. welcome back to "dateline extra". i'm tamron hall. detectives discover that noel stevens reported to be a homeless drug addict had likely burglarized shauna's home, but they still had no evidence that stevens was responsible for her murder. as their search continued, they made a discovery that could have provided answers but only deepened the mystery. let's return to keith morrison with "under a full moon." >> reporter: it is not on any si...