Chicago police described Jackson as "a man with the body of a giant and the brain of a child", who was known in syndicate circles as a mob "juice" collector who specialized in pain for delinquent customers.
Jackson was impaled through his rectum with a meat hook, hanging a foot in the air, while being questioned by mob enforcers.
They stripped him naked, smashed his kneecaps with a bat, one of them shot him with a gun, broke his ribs, stuck him with sharp objects, used a cattle prod on his penis and anus making him evacuate his bowels, and burned parts of his body with a blow torch.
Jackson's body was found on August 12, 1961, in the trunk of his own car, which had been abandoned on Lower Wacker Drive in Chicago.
[1] According to Gus Russo, author of The Outfit, there were Mob insiders who believed Jackson was killed for raping an imprisoned Mob-connected burglar's wife.