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Jake Gyllenhaal

Robert Graysmith

Mark Ruffalo

David Toschi

Anthony Edwards

William Armstrong

Robert Downey Jr.

Paul Avery

Chloë Sevigny

Melanie

Elias Koteas

Jack Mulanax

John Carroll Lynch

Arthur Leigh Allen

Brian Cox

Melvin Belli

Dermot Mulroney

Martin Lee

Charles Fleischer

Bob Vaughn

Zach Grenier

Mel Nicolai

Philip Baker Hall

Sherwood Morrill

James Le Gros

George Bawart

Donal Logue

Ken Narlow

Richmond Arquette

Zodiac 1 / Zodiac 2

Bob Stephenson

Zodiac 3

John Lacy

Zodiac 4

Ed Setrakian

Al Hyman

John Getz

Templeton Peck

John Terry

Charles Thieriot

Candy Clark

Carol Fisher

June Diane Raphael

Mrs. Toschi

Ciara Hughes

Darlene Ferrin

Lee Norris

Young Mike Mageau

Patrick Scott Lewis

Bryan Hartnell

Pell James

Cecilia Shepard

David Lee Smith

Father

Jason Wiles

Lab Tech Dagitz

Charles Schneider

Cabbie / Paul Stine

James Carraway

Shorty

Tom Verica

Jim Dunbar

Jimmi Simpson

Mike Mageau

Doan Ly

Belli's Housekeeper

Karina Logue

Woman

Joel Bissonnette

Inspector Kracke

John Mahon

Riverside Captain

Matt Winston

John Allen

Jules Bruff

Catherine Allen

John Ennis

Terry Pascoe

J. Patrick McCormack

Police Commissioner

Adam Goldberg

Duffy Jennings

Clea DuVall

Linda del Buono

Paul Schulze

Sandy Panzarella

Adam Trese

Detective #1

Penny Wallace

Mulanax's Secretary

John Hemphill

Donald Cheney

Michel Francoeur

Man on Marquee

Thomas Kopache

Copy Editor #1

Barry Livingston

Copy Editor #3

Christopher John Fields

Copy Editor #4

Jack Samson

Young David Graysmith

Micah Sauers

David Graysmith

Zachary Sauers

Aaron Graysmith

Jessica Baltutis

Margot Graysmith

Peter Quartaroli

Patrolman Fouke

Geoff Callan

Patrolman Zelms

Michael Hungerford

Truck Driver

Anna Katarina

Society Woman

E.P. McKnight

Informant (Hall of Justice A)

Betty Murphy

Informant

Jeff Daniel Phillips

Informant

Shane Woodson

Informant

Cookie Crawford

Informant #8

Cassius M. Willis

Uniform Cop

Judith Drake

Florence Douglas

Phoebe Holston

Prison Guard

Marty Lodge

Pinole Foreman

Cooper Thornton

Internal Affairs Agent #1

Cazimir Milostan

Internal Affairs Agent #2

Charlotte Ferguson

Kathleen Johns' Baby

Phoebe Ferguson

Kathleen Johns' Baby

Kacey Malmsten

Kathleen Johns' Baby

Karly Malmsten

Kathleen Johns' Baby

JD Cullum

Director

Stanley B. Herman

Staff Editor

Roy Lee Jones

Distraught African American Male

Michael Rose

Navy Project Leader

James Joseph O'Neil

DOD Project Leader

Rod Damer

FBI Codebreaker

John Sarno

Donald Harden

Gloria Grant

Bettye Harden

Brett Rickaby

Detective Roy

M.F. Bernier

Detective #2

Carter Evans

Newscaster #2

Bill Seward

TV News Anchor

Dave Nemeth

Newscaster #4

Ted Garcia

Anchorman #1

Greg Wolf

Interviewer #1

Barry LeBrock

Reporter

Ione Skye

Kathleen Johns (uncredited)

David Winston Barge

Vallejo Desk Ofiicer (uncredited)

Hayati Akbas

Hardware Store Customer (uncredited)

Brad Carr

Camera Man (uncredited)

Mitchell Fink

Reporter (uncredited)

Erica Ford

Traveler (uncredited)

Tish Hicks

Informant (uncredited)

Danielle McKee

Prisoner (uncredited)

Derris Nile

Office Worker (uncredited)

Carmen Plumb

Janie (uncredited)

Callie Thompson

Child Witness (uncredited)

Bud Davis

Patrolman (uncredited)