Cast & Crew

Robert Downey Jr.

as Paul Avery

Jake Gyllenhaal

as Robert Graysmith

Donal Logue

as Ken Narlow

Mark Ruffalo

as David Toschi

Dermot Mulroney

as Martin Lee

Brian Cox

as Melvin Belli

John Getz

as Templeton Peck

Anthony Edwards

as William Armstrong

John Carroll Lynch

as Arthur Leigh Allen

Karina Logue

as Woman

Jimmi Simpson

as Mike Mageau

Elias Koteas

as Jack Mulanax

Adam Goldberg

as Duffy Jennings

John Terry

as Charles Thieriot

Chloë Sevigny

as Melanie

Zach Grenier

as Mel Nicolai

June Diane Raphael

as Mrs. Toschi

James Le Gros

as George Bawart

Clea DuVall

as Linda del Buono

Barry Livingston

as Copy Editor #3

Lee Norris

as Young Mike Mageau

Ione Skye

as Kathleen Johns (uncredited)

Philip Baker Hall

as Sherwood Morrill

Paul Schulze

as Sandy Panzarella

Tom Verica

as Jim Dunbar

Pell James

as Cecilia Shepard

Jason Wiles

as Lab Tech Dagitz

Bob Stephenson

as Zodiac 3

Ciara Hughes

as Darlene Ferrin

Jeff Daniel Phillips

as Informant

Richmond Arquette

as Zodiac 1 / Zodiac 2

John Ennis

as Terry Pascoe

Candy Clark

as Carol Fisher

Adam Trese

as Detective #1

Matt Winston

as John Allen

Charles Fleischer

as Bob Vaughn

John Lacy

as Zodiac 4

Judith Drake

as Florence Douglas

JD Cullum

as Director

Thomas Kopache

as Copy Editor #1

David Lee Smith

as Father

Michael Rose

as Navy Project Leader

Christopher John Fields

as Copy Editor #4

John Hemphill

as Donald Cheney

Anna Katarina

as Society Woman

Brett Rickaby

as Detective Roy

Betty Murphy

as Informant

John Mahon

as Riverside Captain

James Carraway

as Shorty

Joel Bissonnette

as Inspector Kracke

J. Patrick McCormack

as Police Commissioner

Bud Davis

as Patrolman (uncredited)

Marty Lodge

as Pinole Foreman

Jules Bruff

as Catherine Allen

Stanley B. Herman

as Staff Editor

Ted Garcia

as Anchorman #1

Bill Seward

as TV News Anchor

Shane Woodson

as Informant

Mitchell Fink

as Reporter (uncredited)

Doan Ly

as Belli's Housekeeper

Patrick Scott Lewis

as Bryan Hartnell

Peter Quartaroli

as Patrolman Fouke

Cooper Thornton

as Internal Affairs Agent #1

E.P. McKnight

as Informant (Hall of Justice A)

Cazimir Milostan

as Internal Affairs Agent #2

Rod Damer

as FBI Codebreaker

Brad Carr

as Camera Man (uncredited)

Roy Lee Jones

as Distraught African American Male

David Winston Barge

as Vallejo Desk Ofiicer (uncredited)

Geoff Callan

as Patrolman Zelms

Charles Schneider

as Cabbie / Paul Stine

Danielle McKee

as Prisoner (uncredited)

Carmen Plumb

as Janie (uncredited)

Erica Ford

as Traveler (uncredited)

Callie Thompson

as Child Witness (uncredited)

Michel Francoeur

as Man on Marquee

Jack Samson

as Young David Graysmith

James Joseph O'Neil

as DOD Project Leader

Michael Hungerford

as Truck Driver

Cassius M. Willis

as Uniform Cop

Derris Nile

as Office Worker (uncredited)

Ed Setrakian

as Al Hyman

Zachary Sauers

as Aaron Graysmith

Gloria Grant

as Bettye Harden

Tish Hicks

as Informant (uncredited)

Jessica Baltutis

as Margot Graysmith

Hayati Akbas

as Hardware Store Customer (uncredited)

Dave Nemeth

as Newscaster #4

M.F. Bernier

as Detective #2

Penny Wallace

as Mulanax's Secretary

Phoebe Ferguson

as Kathleen Johns' baby

Micah Sauers

as David Graysmith

Cookie Crawford

as Informant #8

Phoebe Holston

as Prison Guard

Charlotte Ferguson

as Kathleen Johns' baby

Kacey Malmsten

as Kathleen Johns' baby

Karly Malmsten

as Kathleen Johns' baby

John Sarno

as Donald Harden

Carter Evans

as Newscaster #2

Greg Wolf

as Interviewer #1

Barry LeBrock

as Reporter