The Alfred Hitchcock Hour (1962)

S3E12 The Crimson Witness

Ernest Mullett, a charming playboy, finds himself at rock bottom after losing his job, wife, and girlfriend—all to his successful and despised brother, Farnum Mullett. Consumed by jealousy and anger, Ernest hatches a chilling plan to replicate the tragic tale of Cain and Abel, transforming his resentment into a deadly obsession.