DeForest Kelley, later on NBC's Star Trek, appeared twice on City Detective, as Benjamin in "An Old Man's Gold" Kelley and in "Crazy Like a Fox", later the title of a Jack Warden CBS detective series of the same name, Crazy Like a Fox.
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Chuck Connors, later Lucas McCain on ABC's The Rifleman, appeared as Sam in the 1955 episode "Trouble in Toyland".
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Carolyn Jones, later of The Addams Family, appeared twice in the episodes "A Girl's Best Friend" and "On the Record".
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He has also written two mystery series based in Manila and late-19th-century New York City, the latter featuring City Detective Virgil Tillman – New York City's "first thinking detective" – and his partner, patrolman Ned Muldoon of the Strong Arm Squad.