An electric cattle prod was used on his genitals and anus.
The official cause of death was determined to be resulting from the cumulative effect of his wounds and the prolonged torture. Context of the Murder
: Jackson was hung by his rectum on a steel meat hook, suspended roughly a foot in the air. The sheer weight of his 300-pound frame reportedly caused the hook to bend.
Jackson was targeted because the Chicago Outfit suspected he was an FBI informant. The brutality of his death, orchestrated by mob figures like "Mad Sam" DeStefano, was intended to send a terrifying message to other potential "snitches". Despite the torture, Jackson reportedly maintained his innocence until his death.