Who Killed Hale Boggs?

Was he nuts or did he verbally attack J. Edgar Hoover because Hoover dropped the ball when it came to investigating Kennedy’s assassination? Why did he sign off on The Warren Commission Report if he had doubts about the “lone nut” theory? Was Boggs a whistle blower who was about to shed light on a conspiracy to kill JFK? We don’t know because Boggs died in a plane crash and it has never been found.