ben hobbs was the ring leader.olved in the attack, and an unknown third man left the dna in the form of semen. three attackers. the identity of the third still a secret, unrevealed by either of the other two all those years later. and about the fact that carol dodge now disagrees with their theory and is now supporting chris tapp, the only man in prison for the murder? what's it like to know that carol is now actively campaigning for his release, believes him an innocent man? >> i think that's part of the process. in some respects, her heart has been broken. >> and she's convinced you got the wrong guy? >> when i heard that, i was genuinely surprised. >> it's been a roller coaster ride for 16 years for her. she's looking for closure. tomorrow or the next day, chris could be guilty in her mind again. >> so perhaps now would be a good time to talk to the man in the middle of all this, the serial confessor, christopher tapp. >> coming up -- >> i didn't kill nobody. >> so why would he confess? tackling the biggest myst