Yes, it certainly seemed as if Thayer David guested on practically every dramatic TV show and appeared in almost every other movie back in the '70s, which makes his passing at only 51 an even greater tragedy because his acting career was going gangbusters. And believe it or not, he did do a Columbo. Well, according to tv.com he appeared in an ep entitled Now You See Him, which was originally shown on February 29, 1976 (the 5th season). MeTV is running Columbo, and how's this for happenstance - according to my DVR's schedule, that very ep is running this coming Sunday (the 10th) at 8pm ET!