Perry Mason (1957)

S1E22 The Case of the Fugitive Nurse

Janet Norris faces accusations of poisoning her physician husband right before his fatal flight in his private aircraft. As the investigation unfolds, it becomes clear that Dr. Norris survived the crash and is instead in Mexico with his nurse lover. The victim of the plane crash turns out to be one Dave Kirby. Despite this revelation, Janet still must go to trial for murder.