He was beheaded.
Their chief residence was Arundel Castle in Sussex.
He was one of two nobles to remain loyal to King Edward II.

The Earl of Arundel and his brother-in-law John de Warenne were the only nobles who remained loyal to King Edward II, after Queen Isabella and her lover Roger Mortimer, 1st Earl of March returned to England in 1326. He had allied himself to the King's favourite Hugh le Despenser, and agreed to the marriage of his son to Despenser's granddaughter. Arundel had previously been granted many of the traitor Mortimer's forfeited estates, and was appointed Justice of Wales in 1322 and Warden of the Welsh Marches in 1325. He was also made Constable of Montgomery Castle which became his principal base.
The Earl of Arundel was captured in Shropshire by the Queen's party.[2] On 17 November 1326 in Hereford, Arundel was beheaded by order of the Queen, leaving Alice de Warenne a widow.