The Alfred Hitchcock Hour (1962)

S3E23 Completely Foolproof

Joe Brisson, a corrupt land developer, is taken aback when his wife, Lisa, announces her intention to divorce him. She demands three-quarters of his vast assets or she threatens to expose his illegal land dealings to the authorities. Unwilling to comply, Joe persuades Lisa's boyfriend, Bobby Davenport, to murder her in exchange for clearing a significant debt. As Joe embarks on a European cruise, he instructs Bobby to wait for a call to kill Lisa. The plan unfolds perfectly until a man barges into Joe's cabin, fatally shooting him after revealing he was hired by Lisa.