Richard Diamond, Private Detective was a classic American detective radio show that aired from 1949 to 1953, created by Blake Edwards. The show starred Dick Powell as a sophisticated and witty former police officer turned private detective, known for smart remarks and solving complex murder cases with support from the police department. The series had a recurring theme, often ending with Diamond singing a popular song to his girlfriend, Helen Asher, played by Virginia Gregg. Lt. Levinson, Diamond's police counterpart and best friend, was portrayed by various actors including Ed Begley, Arthur Q. Bryan, Ted DeCorsia, and Alan Reed. The radio show made a successful transition to television from 1957 to 1960, with David Janssen in the title role and Mary Tyler Moore appearing in the opening scenes. Richard Diamond is characterized by its mix of humor, tough crime-solving, and lighthearted romance.