He was killed, or at least mortally wounded, at the battle of Camlann by his son and nephew, Sir Mordred.
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King Arthur died in a fight with his nephew Mordred. King Arthur fatally wounded Mordred but he was still in tact, so he willingly stabbed King Arthur back before he died.
King Arthur is usually reckoned to have died, or been fatally wounded, at the battle of Camlann - which is provisionally dated to 537 AD.
his son
King Arthur was mortally wounded at the Last Battle. He had to be carried to the water's edge. His sword Excalibur was thrown to, and caught by, the hand of the Lady of the Lake. A barge then carried King Arthur to Avalon.
King Arthur faces off with his son, Mordred in the final battle. Arthur is able to kill Mordred, but not before he was mortally wounded as well. His body was taken to Glastonbury where he died and was buried.