He was killed at the Battle of the Boyne on 1 July 1690 (12 July New Style), whilst going to the aid of Frederick Schomberg, 1st Duke of Schomberg, Commander-in-Chief of all Williamite forces in Ireland, who was wounded during the crossing of the river in the early part of the battle. He was originally buried at the battlefield but at the insistence of his widow, his body was later exhumed and buried inside the church at Castlecaufield, County Tyrone. His body was later rediscovered and re-interred next to that of his wife but not before a cast was taken of his skull.