without solid evidence, the county was forced to set bambi bennett free. boyfriend, prosecutors believed they had enough evidence to bring rick gagnon down, including a surprise witness. here's dennis murphy with more of our story, "the deed." >> rick was in a world of pain. locked up in the county jail facing two murder charges. he shared his woes with another guy in a jumpsuit, two inmates power walking together around the yard. >> we would walk around the pod, do laps. >> the jail yard buddy was named robert mullens, a petty crook who seemed strangely interested in rick's troubles. did he want to talk to you about the case? was he grilling you? >> all the time. >> it seemed everyone in this part of south carolina wanted to know more about this case and its two beloved victims. it took three years, but in 2008, the state was ready to try rig gagnon for the murders of charlie and diane. >> this is purely evidence that establishes a motive for richard gagnon to end the lives of these two people. >> as humphries recalls, the case against rick was always mot