3x1 - The Alfred Hitchcock Hour

Verge Likens is a farmer whose father was killed by a crooked politician named Riley McGrath. Verge returns home to avenge his father's death. He manages to get close to Riley by getting hired as an assistant at a barbershop. After asking the barber to run an errand, Verge is alone with Riley and proceeds to lather up the murdering politician for a shave. Verge vividly describes how he is planning to cut Riley's throat. When the barber returns to the barbershop he finds the door locked. He gets the police who break down the door. Inside they find Verge standing over Riley's dead body. Berge has avenged his father's death and he is not guilty of a crime. Riley died of a heart attack.