On screen
Cast
120 credited performers
Donnie Wahlberg
Detective Joel Stevens
Neal McDonough
Assistant District Attorney David McNorris
Mykelti Williamson
Police Department Detective II Bobby 'Fearless' Smith
Gary Basaraba
Police Department Police Officer III Ray Hechler
Lana Parrilla
Teresa Ortiz, paramedic in season one, rookie police officer in season two
Jason Gedrick
Police Department Police Officer II Tom Turcotte
Nina Garbiras
Andrea Little, a reporter (season one)
Megan Ward
Kelly Stevens
Vanessa Williams
Detective Katherine Pierce
Dorian Harewood
Captain Ronald Hicks
Chase Ellison
Willie Stevens
Kelly Rowan
Marian McNorris
Rick Gomez
Detective Daniel Ramos
Kelly Hu
Rachel Durrel
Matt Craven
Dr. Michael Hirsch
Kim Murphy
Susan
David Proval
Paul Turcotte
Rino Romano
Paul Turcotte in 1976
J.C. Brandy
Chandler
Wendy Schaal
Darlene Beechem
Derek Hamilton
Jimmy Black
Alia Shawkat
Denise Stein
LeVar Burton
Marvin Lloyd
John Kapelos
Hugo Pinkston
Kathleen Wilhoite
Sally McBride
Daniel Zacapa
Carlos Ramirez
Stacy Keach
Jack 'Mac' McNorris
Nathan West
Zack Berman
Bob Clendenin
Doofus
Virginia Madsen
Erika Ashland
Cody Kasch
Trevor 'T.J.' Jankowski Jr.
Shannon Sturges
Cherie Hechler
Chris Gartin
Jonny Rand
Peter Trencher
Coroner
Beau Billingslea
Police Academy Commandant
Tyler Christopher
Holden McKay
Alimi Ballard
Young Marvin Lloyd
Jennifer Sky
Vanessa Griggs / Laura
Lisa Cerasoli
Mia Lang
Sheeri Rappaport
Janice Edwards
Arlen Escarpeta
Cantrel LaFontaine
Alexander Gould
Tom at 8
Christian Camargo
Bradley Dawson
Kate Flannery
Tracey
Larry Joshua
Chet
Miguel A. Núñez Jr.
Freaktown
Raja Fenske
Puppet
Rick Ravanello
Sean Dornan
Trent Cameron
Bernie Leonard
Howard Hesseman
Mel Castle
Kevin Dunn
Ron Berman
Erin Daniels
Officer Karen Crane
Stephen Macht
John Donadoni
Megan Henning
Emily
Wade Williams
Paul Barnes
Joe Penny
Les Van Buren
Ken Davitian
Jewelry Store Owner
Alex Meneses
Vicki Pineda
Tracey Walter
Dwayne
Michael Muhney
Chris Griggs
Katee Sackhoff
Holly
Ernie Grunwald
Charlie Graham
Jessica Lundy
Vivian Colson
Mimi Paley
Rachel Stein
Robert Wisdom
Chronic (Daryl C. Norcott)
Fran Bennett
Beatrice Rahming
Mark Moses
Don Schneider
Marquise Wilson
Friend #3
Gina Hecht
Doreen Stein
Michael Paul Chan
Lobo Chan
Dan Byrd
Eddie Colson
Ramón Franco
Luis Valdoriso
Rebecca Lowman
Lisa
Dayo Ade
Banger
Tommy Hinkley
Mr. Flannery
Jason George
Thomas Paltrow
Doug Hutchison
Wally Pollard
Christopher Gorham
Gordon Sinclair
Robert LaSardo
Pope
Nigel Gibbs
Alex Leonard
Ali Hillis
Melanie Stone
Loren Lester
Homeowner
Paige Hurd
Grace Adams
Fredric Lehne
Reggie Flood
April Grace
Cynthia
Silas Weir Mitchell
Erik Sorenson
Kirk Trutner
Homeless Man
Dempsey Pappion
Young Greg Haymer
Lombardo Boyar
Eddie
Kristin Bauer
Prostitute
Joe Spano
Henry Stein
Paul Moyer
Paul Moyer
Neil Patrick Harris
Peter Corman
David Dunard
Irate Grandfather
Frank John Hughes
Officer Vincent Manzani
Patricia Wettig
Nora Jean Flannery
Beth Grant
Landlady
Gregg Henry
Robert Colson
Garikayi Mutambirwa
Friend #2
Michael Dempsey
Recovering drunk
Bobby Hosea
Greg Haymer
Anthony Montgomery
Recruit Dwight Baker
Richard Erdman
Kevin's Dad
Christopher Kriesa
Warden Frank Collins
David Burke
Jay Colson
Chris Mulkey
Kevin Van Horn
Cullen Douglas
Arnold Rabjohn
Dakota Floeter
Young Wally Pollard
Ray Laska
Edward Nelson
Mark Totty
Chip Pollard
Henry G. Sanders
Police Sergeant Miller
Annika Peterson
Katrina
Demetra Raven
Lara
Brian Sites
Taylor Gates
Salvator Xuereb
John McBride
Ryan Stockstad
Paramedic (uncredited)
Kim Rhodes
Julia Sloane
Gregory White
Judge Harold Denby
Josh Myler
Courier
Robert Trebor
Keith (uncredited)