| Stephen Caffrey |  Appeared in 1 Episode Columbo Goes To College |
| Gary Hershberger |  Appeared in 1 Episode Columbo Goes To College |
| George Hamilton |  Appeared in 2 Episodes, Murderer in A Deadly State Of Mind, Caution: Murder Can Be Hazardous To Your Health |
| Dabney Coleman |  Appeared in 1 Episode Columbo And The Murder Of A Rock Star |