Colin Firth as Ron Lax

Reese Witherspoon as Pam Hobbs

Dane DeHaan as Chris Morgan

Mireille Enos as Vicki Hutcherson

Bruce Greenwood as Judge David Burnett

Elias Koteas as Jerry Driver

Stephen Moyer as John Fogelman

Alessandro Nivola as Terry Hobbs

Amy Ryan as Margaret Lax

Robert Baker as Detective Bryn Ridge

Kevin Durand as John Mark Byers

Michael Gladis as Dan Stidham

James Hamrick as Damien Echols

Martin Henderson as Brent Davis

Kristopher Higgins as Jessie Misskelley

Brian Howe as Detective McDonough

Matt Letscher as Paul Ford

Seth Meriwether as Jason Baldwin

Rex Linn as Chief Inspector Gitchell

Kristoffer Polaha as Val Price

Collette Wolfe as Glori Shettles

Ted Huckabee as Steve Jones

Kerry Cahill as Jo Lynn

Jet Jurgensmeyer as Stevie Branch

Paul Boardman Jr. as Michael Moore

Brandon Spink as Chris Byers

Julie Ivey as Melissa Byers

Jack Coghlan as Aaron Hutcheson

Lori Beth Sikes as Annie

Gary Grubbs as Dale Griffis

Stan Houston as Detective Donald Bray

Matthew Stanton as Detective Durham

Clay Stapleford as Detective Mike Allen

Stephanie Stewart as Domini Teer (as Stephanie Steward)

Bill Murphey as Marty King

Brooke Jaye Taylor as Officer Regina Meeks

Isabella Zentkovich as Amanda Hobbs

Quincy Bonds as Court Officer (as Quincey Bonds)

Morgan Pelligrino as Reporter at Courthouse

Arvell Poe as Bloody Muddy Man

Brandon Carroll as Bobby DeAngelo

Haley Craft as Teenage Employee

Amber Chaney as Older Employee

Scott Poythress as Criminalist

Judd Lormand as Desk Officer

Corey James Wright as HBO Cameraman (as Corey Wright)

Kate Kneeland as Ron's Secretary

Abigail Monet as Girl on Stand

Brandon Wood as Trailer Park Teen

Joey Nappo as Trailer Park Teen

David Ramsey as Baptist Preacher

Lindsey Moser as Teacher at Weaver

Chase Crandell as Marion High School Boy

Stephanie Astalos-Jones as Marion High School Teacher

Orelon Sidney as Memphis TV Reporter

Ron Clinton Smith as Police Sergeant

Jonathan Spencer as Polygraph Examiner

Jody Thompson as Man in Crowd #1

Rob Demery as Man in Crowd #2

Anessa Ramsey as Rosie

Gary Weeks as TV Reporter at Weaver

Holly Firfer as Tabloid Reporter

Thomas Clay Strickland as Lawyer

Joe Berlinger as Very Special Appearance

Bruce Sinofsky as Very Special Appearance

Mike Pniewski as Landlord (uncredited)