right ben hobbs was the ringleader. chris tapp was involved in the attack.na in the form of semen. three attackers. the identity of the third, still a secret. unrevealed by either of the other to all those years later. and about the fact that carol dodge now disagreed with their theory i was 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 he's an innocent man? >> i think it'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 rollercoaster 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 of this. the serial confessor, christopher tapp. >> coming up -- >> i didn't kill nobody. >> so, why would he confess? when "dateline" continues. teline" continues. or atopic dermatitis under control