Richard Diamond, Private Detective is an American detective drama, created by Blake Edwards, which aired on radio from 1949 to 1953, and on television from 1957 to 1960. Shortly before his death in 2004, actor/comedian Alan King wrote a pair of short stories about the character set in 1948. They were published posthumously in 2016.
Dick Powell starred in the Richard Diamond, Private Detective radio series as a light-hearted detective who often ended the episodes singing to his girlfriend, Helen (Virginia Gregg). Other regular cast members included Ed Begley as Rick's friend and former partner on the police force, Lt. Walter Levinson, and Wilms Herbert as Walt's bumbling sergeant, Otis. It began airing on NBC Radio on April 24, 1949, picked up Rexall as a sponsor on April 5, 1950, and continued until December 6, 1950. Many of the shows were either written or directed by Edwards. Its theme, "Leave It to Love", was whistled by Powell at the beginning of each episode.
With Camel cigarettes 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
Dick Powell's company, Four Star Television, produced the television version of Richard Diamond, Private Detective, which premiered in the summer of 1957 on CBS. It returned to CBS in January 1958 for the second season and in February 1959 for the third season, again on CBS. In the fall of 1959, the fourth and final season aired on NBC. (Source: wikipedia.org)