Nikita and Madeline in “Cat And Mouse”

I'm not in the habit of killing people in cold blood.

In this case, you might want to make an exception. In a manner of speaking, she possessed you, in body as well as mind.

Your psych profile suggests that by killing her, I can best exorcise her?

Yes.

I don't think so.

If I do it instead, I think you'll regret it, but the choice is yours.