Well, I have ROTK in my lap so I'll look that part up............Ok here's how the he dies, 'ROTK, The
Battle of The Pelennor Fields'
talking about the Witchking : "but suddenly he too stumbled forword with a cry of pain, and his stroke went wide, driving into the ground.
Merry's
sword had stabbed him from behind, shearing through the black mantle, and passing up beneath the hauberk had pierced through the sinew and up into his mighty knee. '
Éowyn Éowyn' cried Merry. Then tottering, struggling up, with her last strength she drove her between crown and mantle, as the great shoulders bowed before her. Éowyn fell forward upon her fallen foe. But lo! the mantle and hauberk were empty. Shapeless they lay now on the groun, torn and tumbled; and a cry went up into the shuddering air, and faded to a shrill wailing, passing with the wind, a voice bodiless and thin that died, and was swallowed up, and was never heard agian to this age of the world."
Well it never actually says that he dies but it does imply something pretty close to dieing, if not actually doing it. I think that his spirit went to join all
evil spirit's but his body was destroyed and therefore made it immposible for him to stay on earth.