Piers was executed/murdered on 19 June 1312. Guy Beauchamp, earl of Warwick, seized him from the custody of the earl of Pembroke and imprisoned him in Warwick Castle for a few days. The earls of Lancaster, Hereford and Arundel arrived at the castle and sentenced him to death. He was led a couple of miles away to Blacklow Hill, which was on the earl of Lancaster's lands, and beheaded. This was a great favour, a nobleman's death, granted to him because he was the brother-in-law of the earl of Gloucester. His body was taken to Oxford, where the friars couldn't bury him as he had died excommunicate. Eventually, the Pope lifted the excommunication, but Edward II still refused to bury the embalmed body of his beloved favourite until January 1315.
In memoriam: Piers Gaveston, c. 1283 - 19 June 1312.