Éowyn delivers the killing blow against the Witch-king in J.R.R. Tolkien’s The Lord of the Rings.
During the Battle of the Pelennor Fields, Éowyn disguises herself as a rider named Dernhelm and joins the Rohirrim. When the Witch-king of Angmar attacks Théoden, Éowyn stands against him after Merry stabs the wraith with a barrow-blade. She then strikes the Witch-king with her sword.
The prophecy that no living man could kill him is fulfilled through the combined actions of Éowyn and Merry. Éowyn is not a man, and Merry is a male hobbit rather than a man in Tolkien’s wording and narrative categories. This makes the scene a deliberate answer to the Witch-king’s apparent invulnerability.
Aragorn and Gandalf are important opponents of the Nazgûl elsewhere, but neither kills the Witch-king in this battle. Éowyn’s deed also completes her personal arc from frustrated isolation to courageous action.