Hoffa , 62 , vanished the afternoon of July 30 , 1975 , from a parking lot in Oakland County , about 25 miles north of Detroit .
Hoffa , 62 , vanished on the afternoon of July 30 , 1975 , from a parking lot in a Detroit suburb in Oakland County .
, when a tipster said Mallard talked about the incident at a party When Biggs's body was found, authorities had no leads until four months later