What are the four reasons why narrator wants to kill Ralf Underhill in story An Uytterly Perfect Murder?

The story "An Utterly Perfect Murder" doesn't actually contain a character named Ralf Underhill, nor does it depict a narrator planning to kill anyone.

It seems you might be mixing up the details of this story or referencing a different piece of literature.

Could you please double-check the story title or provide more information about the context of your question?