A Lucky Man.

For someone who was too crazy to know what he was doing, you have to admire Kenneth Erskine- The Stockwell Strangler- for his sheer luck in:

• Selecting victims who were unlikely to be able to defend themselves.
• Doing his killings, which he had no control over, in private where no one could intervene to stop him.
• Setting up a web of different back accounts to launder the stolen money through in order to avoid capture.

If his mental illness didn't diminish his capacity to plan his killings in such a way as to reduce the risk to himself, then it doesn't seem like much of an illness to me.