The Alfred Hitchcock Hour (1962)

S3E8 Misadventure

Title: Twisted Deception Plot: Eva, married to the thrifty businessman Henry, finds herself entangled in an affair. When a mysterious man named George, posing as a gas technician, infiltrates their home, he manipulates her into plotting Henry's murder. Just as their scheme appears flawless, George reveals his true intentions—to kill Eva and pin the blame on her husband. Unbeknownst to her, George is actually Colin, Henry's estranged brother. Years ago, Henry had refused Colin a loan for his wife's costly surgery, which ultimately led to her death. Colin has been seeking revenge ever since.