Charles "Chuckie" O'Brien (December 20, 1933 – February 13, 2020)[1] was an American labor union organizer.
[7] While in court, Hoffa was shot by an assailant carrying a BB gun; O'Brien attacked the man, leaving him bloodied.
[10] On the day of Hoffa's disappearance, O'Brien was seen driving a car belonging to Anthony Giacalone's son.
[14] In 1995, the FBI stated that they did not consider O'Brien to be a suspect in the disappearance of Hoffa, and provided him with a letter asking him for his cooperation with the investigation.
[16] Later that year, using DNA testing, the FBI linked strands of human hair found in the car driven by O'Brien to Hoffa.