James Riddle Hoffa was an American labor union leader who served as the president of the International Brotherhood of Teamsters (IBT) from 1957 until 1971.

A presumption of death occurs when a person is believed to be dead, despite the absence of direct proof of the person's death, such as the finding of remains attributable to that person. Such a presumption is typically made by an individual when a person has been missing for an extended period and in the absence of any evidence that person is still alive—or after a shorter period, but where the circumstances surrounding a person's disappearance overwhelmingly support the belief that the person is dead. The presumption becomes certainty if the person has not been located for a period of time that has exceeded their probable life span, such as in the case of Amelia Earhart or Jack the Ripper.