Robert Graysmith
Jake Gyllenhaal
Insp. David Toschi
Mark Ruffalo
Paul Avery
Robert Downey Jr.
Bill Armstrong
Anthony Edwards
Capt. Lee
Dermot Mulroney
Melvin Belli
Brian Cox
Arthur Leigh Allen
John Carroll Lynch
Zodiac No. 1 & 2
Richmond Arquette
Jack Mulanax
Elias Koteas
Ken Narlow
Donal Logue
Zodiac No.3
Bob Stephenson
Zodiac No.4
John Lacy
Linda Ferrin
Clea Duvall
Melanie
Chloƫ Sevigny
Al Hyman
Ed Setrakian
Kathleen John
Ione Skye
Templeton Peck
John Getz
Jim Dunbar
Tom Verica
Charles Theiriot
John Terry
Cabbie Paul Stine
Charles Schneider
Bill Hamlet
Jim McNichols
Carol Fisher
Candy Clark
Cecelia Shepard
Pell James
Melvin Belli's Housekeeper
Doan Ly
Duffy Jennings
Adam Goldberg
Woman
Karina Logue
Mel Nicolai
Zach Grenier
Insp. Kracke
Joel Bissonnette
Mrs. Toschi
June Diane Raphael
Darlene Ferrin
Ciara Hughes
Don Cheney
John Hemphill
Young Mike Mageau
Lee Norris
Bob Vaughn
Charles Fleischer
Bryan Hartnell
Patrick Scott Lewis
Sandy Panzarella
Paul Schulze
Detective No.1
Adam Trese
Sherwood Morrill
Philip Baker Hall
Father
David Lee Smith
Copy Editor No.1
Thomas Kopache
Lab Tech Dagitz
Jason Wiles
Shorty
James Carraway
Mike Mageau
Jimmi Simpson
Riverside Captain
John Mahoney
John Allen
Matt Winston
Riverside Captain
John Mahon
Catherine Allen
Jules Bruff
Terry Pascoe
John Ennis
Police Commissioner
J. Patrick McCormack
Off. George Bawart
James LeGros
Mulanax's Secretary
Penny Wallace
Informant
F. Lennie Bleecher
Man on Marquee
Michel Francoeur
Copy Editor No.3
Barry Livingston
Copy Editor No.4
Christopher John Fields
Young David Graysmith
Jack Samson
David Graysmith
Micah Sauers
Aaron Graysmith
Zachary Sauers
Margot Graysmith
Jessica Baltutis
Patrolman Fouke
Peter Quartaroli
Patrolman Zelms
Geoff Callan
Truck Driver
Michael Hungerford
Society Woman
Anna Katarina
Informant (Hall of Justice A)
E.P. McKnight
Informant
Betty Murphy
Informant
Jeff Daniel Phillips
Informant
Shane Woodson
Informant #8
Cookie Crawford
Uniform Cop
Cassius Willis
Florence Douglas
Judith Drake
Prison Guard
Phoebe Holston
Pinole Foreman
Marty Lodge
Internal Affairs Agent #1
Cooper Thornton
Internal Affairs Agent #2
Cazimir Milostan
Kathleen Johns' baby
Charlotte Ferguson
Kathleen Johns' baby
Phoebe Ferguson
Kathleen Johns' baby
Kacey Malmsten
Kathleen Johns' baby
Karly Malmsten
Director
JD Cullum
Staff Editor
Stanley B. Herman
Distraught African American Male
Roy Lee Jones
Darlene Ferrin
Ciara Moriarty
Navy Project Leader
Michael Rose
DOD Project Leader
James Joseph O'Neil
FBI Codebreaker
Rod Damer
Donald Harden
John Sarno
Bettye Harden
Gloria Grant
Detective Roy
Brett Rickaby
Detective #2
Mark Bernier
Newscaster #2
Carter Evans
TV News Anchor
Bill Seward
Newscaster #4
Dave Nemeth
Anchorman #1
Ted Garcia
Interviewer #1
Greg Wolf
Reporter
Barry LeBrock