>> he just decided, "you know what? i'm gonna tell the truth." >> barnes admitted he was part of the crazy conspiracy that led to the killing of brian wells, the pizza delivery man. a fact he laid out in all its sordid detail. >> he relived the whole thing from the minute he was picked up that day by marjorie diehl-armstrong, to every location that they went through, and what his role was, what everybody else's role was, and how the whole thing was to go down. >> barnes said floyd stockton was also part of the conspiracy. stockton, remember, was rothstein's old friend who once lived in his house. when stockton found out he'd been ratted out, he decided to talk, too, but only in exchange for immunity, a deal barnes never asked for. >> so, independently, they were saying the same things. and then the inmate witnesses that were being talked to by marjorie diehl-armstrong, their information independently corroborated. so, everything started to come together.