The Alfred Hitchcock Hour (1962)

Season 3: Episode 5

While George is headed to see his girlfriend, he meets a mysterious limping stranger who makes George fear for his life. George learns that the stranger is his girlfriend's jealous husband and that his girlfriend arranged this meeting between them in hopes that her husband would kill George. The stranger tells George that she has done this sort of thing before and that he tried, but failed, to kill his wife's last lover. The stranger convinces George to plot revenge and tells him to tamper with the steering of his wife's car. George does as the stranger suggests and his girlfriend dies. George discovers to his dismay, however, that the limping stranger was really his girlfriend's former lover and that he used George to get his revenge on her.