Holt McCallany
as Bill Tench
Jonathan Groff
as Holden Ford
Anna Torv
as Dr. Wendy Carr
Stacey Roca
as Nancy Tench
Hannah Gross
as Debbie Mitford
Zachary Scott Ross
as Brian Tench
Joe Tuttle
as Gregg Smith
Cotter Smith
as Unit Chief Shepard
Albert Jones
as Agent Jim Barney
Lauren Glazier
as Kay Manz
Michael Cerveris
as Ted Gunn
June Carryl
as Camille Bell
Cameron Britton
as Edmund Kemper
Sierra A. McClain
as Tanya Clifton
Alex Morf
as Detective Mark Ocasek
Christopher Livingston
as Wayne Williams
Peter Murnik
as Detective Carver
Joseph Cross
as Benjamin Barnwright
Jesse C. Boyd
as Frank Janderman
Happy Anderson
as Jerry Brudos
Marc Kudisch
as Roger Wade
Duke Lafoon
as Detective Chambers
George R. Sheffey
as John Boylen
Michael Park
as Peter Dean
Brent Sexton
as Garland Periwinkle
Jordan Gelber
as Peter Rathman
Thomas Francis Murphy
as Detective Frank McGraw
Lee Sellars
as Ninkovich
David H. Holmes
as Cody Miller
Julia Crockett
as Sissy Miller
Thomas Philip O'Neill
as Leo Buchanan
Felix Solis
as Detective Molina
Tommy Nohilly
as Jim Conor
Judith Delgado
as Rosemary Gonzales
Cynthia Mace
as Dwight's Mom
Carla Brandberg
as Marge
Tobias Segal
as Dwight
Sean Grennan
as Ken
Andrew Sensenig
as Dr. Henry Cale
Sam Strike
as Monte Rissell
Hamilton Clancy
as Alvin Moran
Amelia Campbell
as Ruth Moran
Austin Archer
as Pinto Driver
Catherine Curtin
as Ruth Barnwright
Jackie Renee Robinson
as Rose Barnwright-Janderman
Lena Olin
as Annaliese Stilman
John Walpole
as Frank's Legal Rep
Jason Davis
as Benjamin's Legal EP
Dashiell Eaves
as D. A. Peterson
Evander Duck, Jr.
as William
Robert Sella
as Gore
Kenneth Israel
as Tony
Jordyn DiNatale
as Julie
Adam Kroloff
as Shoe Store Clerk
Suzanne Hevner
as Janet Ebner
Todd Faulkner
as Detective Barr
Hayden Saunier
as Mary Clark
Grace Rex
as Cheryl Todd
Sarah Wilson
as Lily Mullen
Eric William Morris
as Mike Mullen
Joshua Wills
as Patrick
Chris Mann
as Armstrong
Jack Erdie
as Richard Speck
Enid Graham
as Mrs. Wade
Adam William Zastrow
as Gene Devier
Rhoda Griffis
as Esther Mayweather
Ryan Dinning
as Detective Winston Brassel
Meredith Jackson
as Nurse
Jeb Kreager
as Detective Bernie Drowatzky
Oliver Cooper
as David Berkowitz / Son of Sam
Corey Allen
as William Henry Hance
Michael Filipowich
as William Pierce, Jr.
Robert Aramayo
as Elmer Wayne Henley, Jr.
Christopher Backus
as Tex Watson
Damon Herriman
as Charles Manson
Morgan Kelly
as Paul Bateson