statements, this and that, all were followed up, every one of them. detective mayo traced down a walmart receipt, a minor forgettable purchase but the time stamp cast serious doubt on phil barr's alibi, caught him in a significant lie. >> that's how detailed we were getting. and then they just happened to run into a guy who said he knew barr and mcmannis and peewee. >> and he overheard them talking about killing this girl. he heard david mcmannis say we shouldn't have done that girl that way. if i don't get out of town, i'm going to spend the rest of my life in jail. fi phillip barr said i've only seen a body. barr tells him, shut up we're all going to end up in prison. >> somebody with credibility. >> better than what we had before. >> a key problem remained. >> terrible witnesses.