Dick Powell starred in the Richard Diamond, Private Detective radio series as a rather light-hearted detective who often ended the episodes singing to his girlfriend, Helen. It began on NBC April 24, 1949, picked up Rexall as a sponsor April 5, 1950, and continued until December 6, 1950. The shows were written by Blake Edwards.
With Camel as a sponsor, it moved to ABC from January 5, 1951, to June 29, 1951, with Rexall returning for a run from October 5, 1951, until June 27, 1952.
Substituting for Amos 'n' Andy, it aired Sunday evenings on CBS from May 31, 1953 until September 20, 1953.
Because Dick Powell was known for musical comedies prior to his appearance as Philip Marlowe in Raymond Chandler's Murder, My Sweet (1944) and because he was a detective who sang in Richard Diamond, Private Eye, some regard this radio series as an influence on the character of Philip E. Marlow (Michael Gambon) in Dennis Potter's Chandleresque The Singing Detective (1986).
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