The FBI said at the time that the disappearance could have been linked to Hoffa's efforts to regain power in the Teamsters and to the mob's influence over the union's pension funds.

"I'd like to just prove to everybody that I'm not crazy," Zerilli told NBC 4.

"What happened, happened while I was in jail, and I feel very, very bad about it ... (it) should have never happened to Jim Hoffa."