In several episodes of Columbo, he talks about his wife, but we never see her. In one episode based in Mexico, she is even invited to lunch, but leaves at the last moment. This seems to happen a lot - Columbo keeps talking about her, but we never see her, and she is always busy, or she just left, etc.
Is Mrs Columbo a real person, or just imaginary? Maybe Columbo created her because he is lonely from working too hard?
Has anyone (even another character in the show) actually seen her?