Concerning the Witch King

[Kransha]

Hello all. I'm new here and looking forward to posting on these forums.

*hoping this topic is in the right forum*
When I first read Return of the King there was a passage concerning the "demise" of the Witch King of Angmar which puzzled me.

But lo! The mantle and hauberk were empty. Shapeless they lay now on the ground, 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 again in that age of the world

(Note: If you didn't guess, the italics are my own doing)

So, the Witch King of Angmar fell. Not by man but by woman and hobbit was he slain...or was he? Tolkien says that the voice of the Nazgul Lord died and his hauberk and mantle lay empty. Almost never in his writing does he actually state that he is truly dead. The other Ringwraiths were apparently consumed by the flames of Mount Doom's eruption, but their leader fled the plane of existence on Pelennor Fields. Perhaps, if the situation were right, the Witch King (not the other wraiths) could return, despite the fact that Sauron's power was broken, bla bla bla, etc.

This may be a foolish notion, but I wanted to hear the thoughts of others on the matter. I supposed originally that Tolkein was implying the wraith's death, but why would he be so specific about saying that last phrase.

Your thoughts?