According to what Sheeran told Charles Brandt, the author of I Heard You Paint Houses, he and a few other associates picked up Hoffa at a restaurant called the Red Fox on July 30, 1975 under the guise of bringing him to a meeting at a Detroit house. When they arrived at the house and Hoffa saw that it was empty, he was immediately suspicious and tried to flee. In the book, Sheeran says he shot his friend twice in the back of the head and that he did not suffer. Soon after, Sheeran and his associates brought Hoffa's body to a crematorium.
Though Sheeran later served 13 years of a 32-year prison sentence, it was for labor racketeering, not for the death of Hoffa. Despite all of the witnesses who testified, there wasn't enough evidence for the grand jury to make an indictment. It wasn't even until Sheeran was on his death bed in 2003 (the year before Brandt published his book) that he finally confessed to killing Hoffa to three priests, as well as to Brandt.