wal-mart receipt. a minor purchase except the time stamp cast serious doubt on phil barr's alibi. it caught him in a significant lie. >> that's how detailed they were getting. >> they happened to run into a guy who said he knew and mcmahonis and pee wee. >> he overheard them talking about killing the girl. he said we shouldn't have done that girl that way. if i don't get out of town, i will spend my live n jail. pee wee is talking about i only have seen a body. it's not against the law to see a body and barr said shut up or we will end up in prison. >> somebody with credibility. >> better than what we had before, yeah. >> a key problem remained. >> terrible witnesses. >> meaning detectives spoke with other people who heard the men talk about the murder, but they were not the type a jury would