Tarzan: The Killer (Lord of the Jungle radio series 1951) 

Original Airdate: March 15, 1951
The Killer: Tarzan, Lord of the Jungle radio series
Starring: Lamont Johnson
Herbert Graves, an old enemy seeks revenge against Tarzan and enlists the aid of a giant prizefighter. Dressing the fighter like Tarzan, Graves instructs him to commit several robberies and murders -- all of which are blamed on Tarzan. Tarzan is arrested by his friend, Captain Lawrence, but soon escapes. He discovers Graves and the "killer" in the village of Yumboois, which they have terrorized. A terrific battle ensues with Tarzan emerging victorious.