杰克·吉伦哈尔

Jake Gyllenhaal

饰：罗伯特 Robert Graysmith

马克·鲁法洛

Mark Ruffalo

饰：督察 Inspector David Toschi

小罗伯特·唐尼

Robert Downey Jr.

饰：保罗·艾弗里 Paul Avery

安东尼·爱德华兹

Anthony Edwards

饰：督察威廉·阿姆斯特朗 Inspector William Armstrong

布莱恩·考克斯

Brian Cox

饰：梅尔文·贝利 Melvin Belli

约翰·卡洛·林奇

John Carroll Lynch

饰：阿瑟·艾伦利 Arthur Leigh Allen

里奇蒙德·阿奎特

Richmond Arquette

饰：Zodiac 1 & 2

鲍勃·斯蒂芬森

Robert J. Stephenson

饰：Zodiac 3

约翰·莱西

John Lacy

饰：Zodiac 4

科洛·塞维尼

Chloë Sevigny

饰：Melanie

艾德·塞特拉基安

Ed Setrakian

饰：Al Hyman

约翰·盖兹

John Getz

饰：Templeton Peck

约翰·泰瑞

John Terry

饰：Charles Thieriot

坎迪·克拉克

Candace June Clark

饰：Carol Fisher

伊莱亚斯·科泰斯

Elias Koteas

饰：Sgt. Jack Mulanax

德蒙特·莫罗尼

Dermot Mulroney

饰：Captain Marty Lee

唐纳尔·罗格

Donal Logue

饰：Captain Ken Narlow

琼·戴安·拉法尔

June Diane Raphael

饰：Mrs. Toschi (as June Raphael)

李·诺里斯

Lee Michael Norris

饰：Mike Mageau - Young

Patrick Scott Lewis

饰：Bryan Hartnell

贝尔·詹姆斯

Pell James

饰：Cecilia Shepard

菲利普·贝克·霍尔

Philip Baker Hall

饰：Sherwood Morrill

大卫·李·史密斯

David Lee Smith

饰：Father

Ciara Hughes

Ciara Hughes

饰：Darlene Ferrin

Jules Bruff

Jules Bruff

饰：Catherine Allen

Penny Wallace

Penny Wallace

饰：Mulanax's Secretary

Benjamin Hartnell

Benjamin Hartnell

饰：Extra (unconfirmed) (uncredited)

Bryan C. Hartnell

Bryan C. Hartnell

饰：Man in Hallway (uncredited)

Jonathan Hartnell

Jonathan Hartnell

饰：Extra (unconfirmed) (uncredited)

Monica Hartnell

Monica Hartnell

饰：Woman in Hallway (uncredited)

Tish Hicks

Tish Hicks

饰：Informant (uncredited)

Micah Sauers

饰：David Graysmith (uncredited)

Zachary Sauers

Zachary Sauers

饰：Aaron Graysmith (uncredited)

Callie Thompson

Callie Thompson

饰：Child Witness (uncredited)

巴里·里维斯顿

Barry Livingston

饰：Copy Editor #3

丹妮尔·麦基

Danielle McKee

饰：Prisioner (uncredited)

David Hodges

David Hodges

饰：Chronicle Artist (uncredited)

杰弗·卡伦

Geoff Callan

饰：Patrolman Zelms (uncredited)

布雷特·里克比

Brett Rickaby

饰：Detective Roy (uncredited)

Shane Woodson

饰：Informant (uncredited)

Brad Carr

Brad Carr

饰：Camera Man (uncredited)

Cassius Clay

饰：Uniform Cop (uncredited)

克里斯托弗·约翰·菲尔兹

Christopher John Fields

饰：Copy Editor #4 (as Christopher Fields)

托马斯·科帕切

Thomas Kopache

饰：Copy Editor #1

艾农·斯凯

Ione Skye

饰：Kathleen Johns (uncredited)

杰弗里·丹尼尔·菲利普斯

Jeffrey Daniel Phillips

饰：Informant (uncredited)

米歇尔·法兰库尔

Michel Francoeur

饰：Man on Marquee

Rod Damer

饰：FBI codebreaker (uncredited)

Betty Murphy

Betty Murphy

饰：Informant (uncredited)

彼得·夸塔罗利

Peter Quartaroli

饰：Patrolman Fouke (uncredited)

Jack Samson

Jack Samson

饰：Young David Graysmith (uncredited)

米切尔·芬克

Mitchell Fink

饰：Reporter (uncredited)

Felix J. Boyle

Felix J. Boyle

饰：Airport Passenger (uncredited)

John Hemphill

John Hemphill

饰：Donald Cheney

David Winston Barge

David Winston Barge

饰：Vallejo Desk Ofiicer (uncredited)

比尔·苏厄德

Bill Seward

饰：TV News Anchor (uncredited)

James Carraway

James Carraway

饰：Shorty

克丽·杜瓦尔

Clea DuVall

饰：Linda del Buono (as Clea Duvall)

Karina Logue

Karina Logue

饰：Woman

扎克·格雷尼尔

Zach Grenier

饰：Mel Nicolai

查尔斯·弗莱舍

Charles Fleischer

饰：Bob Vaughn

亚当·戈德堡

Adam Goldberg

饰：Duffy Jennings

吉米·辛普森

Jimmi Simpson

饰：Mike Mageau

乔伊·比索奈特

Joel Bissonnette

饰：Inspector Kracke

马特·温斯顿

Matt Winston

饰：John Allen

约翰·马洪

John Mahon

饰：Riverside Captain

J.帕特里克·麦克康尔马克

J. Patrick McCormack

饰：Police Commissioner

詹姆斯·勒格罗

James LeGros

饰：Officer George Bawart (as James Le Gros)

查尔斯·斯奈德

Charles Schneider

饰：Cabbie,Paul Stine

詹森·威尔斯

Jason Wiles

饰：Lab Tech Dagitz

汤姆·维里卡

Tom Verica

饰：Jim Dunbar

约翰·恩尼斯

John Ennis

饰：Terry Pascoe

亚当·崔斯

Adam Trese

饰：Detective #1

保罗·舒尔茨

Paul Schulze

饰：Sandy Panzarella

Doan Ly

Doan Ly

饰：Belli's Housekeeper

安娜·卡塔莉娜

Anna Katarina

饰：Society Woman

卡休斯·威利斯

Cassius Willis

饰：Uniform Cop

Michael Hungerford

饰：Truck Driver,(as Mike Hungerford)

Cookie Crawford

饰：Informant #8

朱迪丝·德雷克

Judith Drake

饰：Florence Douglas

Marty Lodge

Marty Lodge

饰：Pinole Foreman

卡兹米尔·米洛斯坦

Cazimir Milostan

饰：Internal Affairs Agent #2

斯坦利·B·赫尔曼

Stanley B. Herman

饰：Staff Editor

迈克尔·罗斯

Michael Rose

饰：Navy Project Leader

Gloria Grant

饰：Bettye Harden

Marlo Bernier

饰：Detective #2,(as Mark Bernier)

Ted Garcia

Ted Garcia

饰：Anchorman #1

Barry LeBrock

饰：Reporter

Phoebe Holston

Phoebe Holston

饰：Prison Guard

库珀·索恩顿

Cooper Thornton

饰：Internal Affairs Agent #1

JD·库鲁姆

JD Cullum

饰：Director

罗伊·李·琼斯

Roy Lee Jones

饰：Distraught African American Male

James Joseph O'Neil

饰：DOD Project Leader

John Sarno

饰：Donald Harden

Carter Evans

饰：Newscaster #2

Dave Nemeth

Dave Nemeth

饰：Newscaster #4