Season Regulars 7

1. 

   Donnie Wahlberg

   Detective Joel Stevens

2. 

   Neal McDonough

   Assistant District Attorney David McNorris

3. 

   Mykelti Williamson

   Police Department Detective II Bobby 'Fearless' Smith

4. 

   Gary Basaraba

   Police Department Police Officer III Ray Hechler

5. 

   Nina Garbiras

   Andrea Little, a reporter (season one)

6. 

   Lana Parrilla

   Teresa Ortiz, paramedic in season one, rookie police officer in season two

7. 

   Jason Gedrick

   Police Department Police Officer II Tom Turcotte

Guest Stars 10

1. 

   Rick Gomez

   Detective Daniel Ramos

2. 

   Alia Shawkat

   Denise Stein

3. 

   Erin Daniels

   Officer Karen Crane

4. Mimi Paley

   Rachel Stein

5. 

   Megan Ward

   Kelly Stevens

6. 

   Gina Hecht

   Doreen Stein

7. 

   Dorian Harewood

   Captain Ronald Hicks

8. 

   Joe Spano

   Henry Stein

9. 

   Cullen Douglas

   Arnold Rabjohn

10. 

    Ray Laska

    Edward Nelson

Crew 1