Charlize Theron as Libby Day

Nicholas Hoult as Lyle Wirth

Chloë Grace Moretz as Young Diondra Wertzner

Christina Hendricks as Patty Day

Tye Sheridan as Young Ben Day

Corey Stoll as Ben Day

Andrea Roth as Diondra Wertzner

Sterling Jerins as Young Libby Day

Shannon Kook as Young Trey Teepano

Drea de Matteo as Krissi Cates

Sean Bridgers as Runner Day

J. LaRose as Trey Teepano

Jennifer Pierce Mathus as Diane

Denise Williamson as Crystal

Natalie Precht as Michelle Day

Madison McGuire as Debby Day

Addy Miller as Young Krissi Cates

Jeff Chase as Calvin Diehl

Laura Cayouette as Krissi Cates' Mother

Richard Gunn as Lou Cates

Glenn Morshower as Jim Jeffreys

Lori Z. Cordova as Magda

Michael Crabtree as Joseph

John F. Daniel as Bob Berdella

Steve Shearer as Bert Nolan

Dan Hewitt Owens as Robert

Gillian Flynn as Kill Club Goer

Tyler Forrest as Warehouse Guitarist

Dora Madison as Warehouse Girl

Sheri Davis as Bar Patron

Sarah Eilts as Manson Girl

Cody Daniel as Mike Allen

Lawrence P. Beron as Mr. Gruber