Alfred Hitchcock Presents: No Pain (1959)

Dave Rainey was once a healthy, successful individual. He now finds himself struck down in the prime of his life and confined to an iron lung. He has a full-time nurse and his pretty wife is attentive, but he is concerned at her friendship with Arnold Barrett. One evening, she gives their full-time nurse the evening off and Dave concludes this must be the evening that she will finish him off. He confronts her and she admits that she had been planning this for some time but in the end, she is unable to complete the task. Little does she know that Dave has his own plans for her.