Boris Karloff's Thriller - The Watcher

Season 1 Episode 8, 1960, Hosted by Boris Karloff , A schoolteacher and religious hypocrite takes a creepy interest in a handsome 20-year-old and the girl supposedly corrupting him. He murders her, but then discovers the young man has a more serious interest in another "corrupter".
Written by Donald S. Sanford
Directed by John Brahm
Starring Martin Gabel , Richard Chamberlain , and Olive Sturgess
Original Air Date November 1, 1960