They join previously announced Michael Chernus who portrays the titular real-life serial killer.
Its inspired by the 2021 Peacock docuseries produced by NBC News Studios of the same name.
UCP, a division of Universal Studio Group, is the studio.
L-R: Gabriel Luna, James Badge Dale, Michael Angarano, Chris Sullivan & Marin IrelandJonny Marlow/Michael Schwartz/Getty
