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