Riverdale Season 1, Episode 12, "Chapter Twelve: Anatomy of a Murder," reveals Clifford Blossom as the killer of his son, Jason, following the discovery of a damning video on a USB drive. Amidst revelations of a coerced confession from F.P. Jones and a familial connection between the Coopers and Blossoms, the episode concludes with Clifford's apparent suicide. For a full recap, visit Entertainment Weekly . 'Riverdale' Recap: Chapter 12 - Entertainment Weekly