S1 E012 - Chapter Twelve: Anatomy of A Murder
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Riverdale: Every Movie That Inspired The Episode Titles

12. S1 E012 - Chapter Twelve: Anatomy of A Murder
Anatomy of A Murder (1959) - A lawyer takes on the case of an Army Lieutenant who murders an innkeeper. On Riverdale, the gang further unravel the mysterious killing of Jason Blossom. In this episode, we learn who really took Jason's life.