§ Of Maeglin The Silmarillion

It was appointed that Eöl should be brought on the next day to the King's judgement; and Aredhel and Idril moved Turgon to mercy. But in the evening Aredhel sickened, though the wound had seemed little, and she fell into the darkness, and in the night she died; for the point of the javelin was poisoned, though none knew it until too late.