Sean Penn
Jimmy Markum

Tim Robbins
Dave Boyle

Kevin Bacon
Sean Devine

Laurence Fishburne
Whitey Powers

Marcia Gay Harden
Celeste Boyle

Laura Linney
Annabeth Markum

Kevin Chapman
Val Savage

Tom Guiry
Brendan Harris

Emmy Rossum
Katie Markum

Spencer Treat Clark
Silent Ray Harris

Adam Nelson
Nick Savage

Robert Wahlberg
Kevin Savage

Jenny O'Hara
Esther Harris

John Doman
Driver

Cameron Bowen
Young Dave

Connor Paolo
Young Sean

Cayden Boyd
Michael Boyle

Tori Davis
Lauren Devine

Jonathan Togo
Pete

Shawn Fitzgibbon
Funeral Director

Will Lyman
FBI Agent Birden

Celine du Tertre
Nadine Markum

Ari Graynor
Eve Pigeon

Zabeth Russell
Diane Cestra

Joe Stapleton
Drew Pigeon

Susan Willis
Mrs. Prior

José Ramón Rosario
Lt. Friel

Tom Kemp
CSS Tech

Lonnie Farmer
Lab Technician

Celeste Oliva
Trooper Jenny Coughlin

Bates Wilder
Loud Mouth Cop

Bill Thorpe
Neighbor at Barricade

Matty Blake
Cop in Park

Ken Cheeseman
Dave's Friend in Bar

John Franchi
Bar Patron (uncredited)

Colleen Kelly
Boston Cop (uncredited)

Eli Wallach
Mr. Loonie (uncredited)

Kevin Conway
Theo (uncredited)

Frank Ridley
Police Detective (uncredited)

Kris Williams
Spectator (uncredited)

Jillian Wheeler
Sara Markum (uncredited)

Lance Norris
Bartender (uncredited)