Orson Welles and The Black Museum.

Illustration of Orson Welles 
to advertise The Lives of
Harry Lime, ca. 1951

Over on Wellesnet, Ray Kelly discusses Orson Welles' role in The Black Museum, an early true-crime radio program based on Scotland Yard cases, and The Adventures of Harry Lime (US title: The Lives of Harry Lime), a radio program based on Welles's shady character in the film The Third Man. 

Listen to Black Museum episodes here.
Listen to The Lives of Harry Lime episodes here.