Jake Gyllenhaal

Robert Graysmith

Acting

Mark Ruffalo

David Toschi

Acting

Anthony Edwards

William Armstrong

Acting

Robert Downey Jr.

Paul Avery

Acting

Chloë Sevigny

Melanie

Acting

Elias Koteas

Jack Mulanax

Acting

John Carroll Lynch

Arthur Leigh Allen

Acting

Brian Cox

Melvin Belli

Acting

Dermot Mulroney

Martin Lee

Acting

Charles Fleischer

Bob Vaughn

Acting

Zach Grenier

Mel Nicolai

Acting

Philip Baker Hall

Sherwood Morrill

Acting

James Le Gros

George Bawart

Acting

Donal Logue

Ken Narlow

Acting

Richmond Arquette

Zodiac 1 / Zodiac 2

Acting

Bob Stephenson

Zodiac 3

Acting

John Lacy

Zodiac 4

Acting

Ed Setrakian

Al Hyman

Acting

John Getz

Templeton Peck

Acting

John Terry

Charles Thieriot

Acting

Candy Clark

Carol Fisher

Acting

June Diane Raphael

Mrs. Toschi

Acting

Ciara Hughes

Darlene Ferrin

Acting

Lee Norris

Young Mike Mageau

Acting

Patrick Scott Lewis

Bryan Hartnell

Acting

Pell James

Cecilia Shepard

Acting

David Lee Smith

Father

Acting

Jason Wiles

Lab Tech Dagitz

Acting

Charles Schneider

Cabbie / Paul Stine

Acting

James Carraway

Shorty

Acting

Tom Verica

Jim Dunbar

Acting

Jimmi Simpson

Mike Mageau

Acting

Doan Ly

Belli's Housekeeper

Acting

Karina Logue

Woman

Acting

Joel Bissonnette

Inspector Kracke

Acting

John Mahon

Riverside Captain

Acting

Matt Winston

John Allen

Acting

Jules Bruff

Catherine Allen

Acting

John Ennis

Terry Pascoe

Acting

J. Patrick McCormack

Police Commissioner

Acting

Adam Goldberg

Duffy Jennings

Acting

Clea DuVall

Linda del Buono

Acting

Paul Schulze

Sandy Panzarella

Acting

Adam Trese

Detective #1

Acting

Penny Wallace

Mulanax's Secretary

Acting

John Hemphill

Donald Cheney

Acting

Michel Francoeur

Man on Marquee

Acting

Thomas Kopache

Copy Editor #1

Acting

Barry Livingston

Copy Editor #3

Acting

Christopher John Fields

Copy Editor #4

Acting

Jack Samson

Young David Graysmith

Acting

Micah Sauers

David Graysmith

Acting

Zachary Sauers

Aaron Graysmith

Acting

Jessica Baltutis

Margot Graysmith

Acting

Peter Quartaroli

Patrolman Fouke

Acting

Geoff Callan

Patrolman Zelms

Acting

Michael Hungerford

Truck Driver

Acting

Anna Katarina

Society Woman

Acting

E.P. McKnight

Informant (Hall of Justice A)

Acting

Betty Murphy

Informant

Acting

Jeff Daniel Phillips

Informant

Acting

Shane Woodson

Informant

Acting

Cookie Crawford

Informant #8

Acting

Cassius M. Willis

Uniform Cop

Acting

Judith Drake

Florence Douglas

Acting

Phoebe Holston

Prison Guard

Acting

Marty Lodge

Pinole Foreman

Acting

Cooper Thornton

Internal Affairs Agent #1

Acting

Cazimir Milostan

Internal Affairs Agent #2

Acting

Charlotte Ferguson

Kathleen Johns' baby

Acting

Phoebe Ferguson

Kathleen Johns' baby

Acting

Kacey Malmsten

Kathleen Johns' baby

Acting

Karly Malmsten

Kathleen Johns' baby

Acting

JD Cullum

Director

Acting

Stanley B. Herman

Staff Editor

Acting

Roy Lee Jones

Distraught African American Male

Acting

Michael Rose

Navy Project Leader

Acting

James Joseph O'Neil

DOD Project Leader

Acting

Rod Damer

FBI Codebreaker

Acting

John Sarno

Donald Harden

Acting

Gloria Grant

Bettye Harden

Acting

Brett Rickaby

Detective Roy

Acting

M.F. Bernier

Detective #2

Acting

Carter Evans

Newscaster #2

Acting

Bill Seward

TV News Anchor

Acting

Dave Nemeth

Newscaster #4

Acting

Ted Garcia

Anchorman #1

Acting

Greg Wolf

Interviewer #1

Acting

Barry LeBrock

Reporter

Acting

Ione Skye

Kathleen Johns (uncredited)

Acting

David Winston Barge

Vallejo Desk Ofiicer (uncredited)

Acting

Hayati Akbas

Hardware Store Customer (uncredited)

Acting

Brad Carr

Camera Man (uncredited)

Camera

Mitchell Fink

Reporter (uncredited)

Acting

Erica Ford

Traveler (uncredited)

Acting

Tish Hicks

Informant (uncredited)

Acting

Danielle McKee

Prisoner (uncredited)

Acting

Derris Nile

Office Worker (uncredited)

Acting

Carmen Plumb

Janie (uncredited)

Acting

Callie Thompson

Child Witness (uncredited)

Acting

Bud Davis

Patrolman (uncredited)

Crew