Perry Mason S02 E25 The Case of the Petulant Partner

"Almost anyone is capable of a crime under certain circumstances."

Harry Bright and Chuck Clark were once best friends and business partners until Margaret entered the picture. Margaret was a much younger woman on the make who entranced Chuck into marrying her. When Margaret is found shot to death, Harry is arrested for the crime but the more Perry digs into the victim's past the more convoluted things get.