The Tales of the Texas Rangers The Lucky Dollar Ep 22 1950s True Crime Old Time Radio Show 

A storekeeper is murdered by a robber who shuts off the electricity inside the store. A special kind of dollar leads the Rangers to a young Mexican girl and a “Dandy” suspect.
About:
Tales of the Texas Rangers is a 20th century Western old-time radio and television police procedural drama which originally aired on NBC Radio from 1950 to 1952 and later on CBS Television from 1955 to 1958. Film star Joel McCrea voiced the radio version as the fictitious Texas Ranger Jace Pearson, who uses the latest scientific techniques to identify criminals. His faithful horse, Charcoal (or "Charky"), helps Pearson to track down the culprits. The radio shows are reenactments of actual Texas Ranger cases.
(Wikipedia)