 The childrens 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 (qv), as political candidate Nelson  Hayward) is seen using it, in this case whistling it, as he prepares  to film a campaign commercial.