He died on 7 may 1243 and was buried at Wymondham Abbey in Norfolk. His large estates were divided amongst his four sisters and their issue. His title of Earl of Arundel was inherited by his nephew John FitzAlan, 6th Earl of Arundel, son of his sister Isabel d'Aubigny.[4]
He had married Isabel de Warenne (c. 1228–1282), daughter of William de Warenne, 5th Earl of Surrey and Maud Marshal (1192–1248). She was 17 at the time of his death and they had no children.[3] His widow never remarried but became an important countess who founded the Cistercian Abbey at Marham and may have been buried in the Convent Church in Marham.