You mean Théoden?
Denethor was an asshole, the Witch King can have him for all I care. 
This reminds me of when I was in 4th Grade I think and we had read
The Hobbit along with the teacher for Literature class. When it was time to quiz us, the teacher sat me next to a boy who decided to cheat on the test by glancing over to my sheet of paper and copying my answers.
He was hardly sutil in his attempts and I quickly noticed what he was doing. Because I didn't like him at all, and didn't want to get into trouble after us both handing in identical test papers, I wrote down the wrong answers to all the questions and after I saw that he had copied them I quickly erased them and wrote what I thought was correct.
When the test results came back I had done really well, and he obviously hadn't. He was livid when he came to me and asked why I had changed my answers -- that those weren't the ones he had copied.
What do you even reply to a person like that?