The children's song, "This Old Man" appears in almost every episode of the Columbo series, sometimes as background music, but more often Lt. Columbo is seen singing, humming, or whistling the tune. The episode, "Candidate for Crime" is the only episode where the murderer ('Jackie Cooper', as political candidate Nelson Hayward) is seen using it, in this case whistling it, as he prepares to film a campaign commercial.
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