David Greene Director Jim Hutton Ellery Queen Actor David Wayne Inspector Richard Queen Actor Ray Milland Carson McKell Actor Kim Hunter Marion McKell Actor Monte Markham Tom McKell Actor John Hillerman Simon Brimmer Actor John Larch District Attorney Actor Tim O'Connor Ben Waterson Actor Nancy Kovack Monaca Grey Actor Warren Berlinger Eddie Carter Actor Harry von Zell Announcer Actor Gail Strickland Gail Stevens Actor Tom Reese Sgt. Thomas Velie Actor Victor Mohica Ramon Actor Dawn Smith Cora Edwards Actor Jimmy Lydon Actor Actor John Finnegan Matthew Thomas Cleary Actor Rosanna Huffman Radio Actress Actor Basil Hoffman Fingerprint Expert Actor Ross Elliott Judge Actor Richard Levinson Producer William Link Producer