Actors:
Jake Gyllenhaal - Robert Graysmith
Actors:
Mark Ruffalo - Inspector David Toschi
Actors:
Anthony Edwards - Inspector William Armstrong
Actors:
Robert Downey, Jr. - Paul Avery
Actors:
Brian Cox - Melvin Belli
Actors:
John Carroll Lynch - Arthur Leigh Allen
Actors:
Richmond Arquette - Zodiac 1 & 2
Actors:
Bob Stephenson - Zodiac 3
Actors:
John Lacy - Zodiac 4
Actors:
Chlo? Sevigny - Melanie
Actors:
Ed Setrakian - Al Hyman
Actors:
John Getz - Templeton Peck
Actors:
John Terry - Charles Thieriot
Actors:
Candy Clark - Carol Fisher
Actors:
Elias Koteas - Sgt. Jack Mulanax
Actors:
Dermot Mulroney - Captain Marty Lee
Actors:
Donal Logue - Captain Ken Marlow
Actors:
June Raphael - Mrs. Toschi
Actors:
Ciara Hughes - Darlene Ferrin
Actors:
Lee Norris - Mike Mageau-Young
Actors:
Patrick Scott Lewis - Bryan Hartnell
Actors:
Pell James - Cecilia Shepard
Actors:
Philip Baker Hall - Sherwood Morrill
Actors:
David Lee Smith - Father
Actors:
Jason Wiles - Lab Tech Dagitz
Actors:
Charles Schneider - Cabbie/Paul Stine
Actors:
James Carraway - Shorty
Actors:
Tom Verica - Jim Dunbar
Actors:
Jimmi Simpson - Mike Mageau
Actors:
Doan Ly - Belli's Housekeeper
Actors:
Karina Logue - Woman
Actors:
Joel Bissonnette - Inspector Kracke
Actors:
Zach Grenier - Mel Nicolai
Actors:
John Mahon - Riverside Captain
Actors:
Matt Winston - John Allen
Actors:
Jules Bruff - Catherine Allen
Actors:
John Ennis - Terry Pascoe
Actors:
J. Patrick McCormack - Police Commissioner
Actors:
Adam Goldberg - Duffy Jennings
Actors:
James Le Gros - Detective George Bawart
Actors:
Charles Fleischer - Bob Vaughn
Actors:
Clea DuVall - Linda del Buono
Actors:
Paul Schulze - Sandy Panzarella
Actors:
Adam Trese - Detective #1
Actors:
Penny Wallace - Mulanax's Secretary
Actors:
John Hemphill - Donald Cheney
Actors:
Michael Francoeur - Man on Marquee
Actors:
Thomas Kopache - Copy Editor #1
Actors:
Barry Livingston - Copy Editor #3
Actors:
Christopher John Fields - Copy Editor #4
