Fleming: You know, sometimes I get the impression you think I killed my wife.
Columbo: You? Oh no, Doc. How could you? You were out of town.
Fleming: I'm glad you remembered that. Unless you think I hired someone to kill her. The boy who confessed, maybe I paid him to do it.
Columbo: No, Doc. You didn't do that.
Fleming: How do you know?
Columbo: I already asked him.