S1 E03 - Chapter Three: Body Double
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Riverdale: Every Movie That Inspired The Episode Titles

3. S1 E03 - Chapter Three: Body Double
Body Double (1984) - A young actor house-sits in a Beverly Hills home. While looking through a window with a telescope, the young man witnesses the murder of a beautiful young woman. The episode title likely ties into "Dark Betty" would-be "body double" for the girl next door.