S1·E10 The Case of the Runaway Corpse

Ed Davenport learns that a sandwich he requested to be tested by a lab contains arsenic and blames his wife Myrna. When he confronts her about his suspicions, she denies it. He leaves for a business trip and falls ill. Dr. Renault is called to treat him at a motel where Ed Davenport later dies. Before he dies he claims his wife poisoned some candy.