Hoffa’s disappearance remains one of the 20th century’s great unsolved mysteries. Many of those with links to the Hoffa case have taken secrets to their graves — Giacomo "Black Jack" Tocco, Leonard Schultz, Vito "Billy Jack" Giacalone, Anthony Giacalone, Tony Zerilli, and so on.
There have been many fruitless searches for his body in recent years, including one that ended June 20, 2013, after the FBI spent three days combing a 1-acre site in Oakland Township near Buell and Adams roads. The search, prompted by a tip from an aging mobster, brought out 40 agents, cadaver dogs, forensic anthropologists and an earth mover. But it didn't uncover human remains.