Tales from the Crypt (1989) : 3x10

Charlie Mackenzie is an out of work reporter who wants his life back. One night while at his favorite bar hang out, Charlie meets a beautiful women who seems to turn his life around. He gets his job back, but his boss agrees to rehire him only if Charlie can bring in a murder story soon. One night while at Greek diner he overhears the owner strangle his girlfriend. Charlie interviews him and goes to where the body is, but she is not dead. Charlie discovers that it's his girlfriend Vicky. To make sure the paper's got enough evidence, he strangles her to death but the shock of the murder lands him in a mental hospital inside a padded cell.