Responding to a domestic disturbance call, Ray and Tom find themselves in the middle of a homicide investigation as their feuding couple is linked to a fatal meth lab explosion; when the husband has his throat cut outside of the police station, their drug dealer becomes the prime suspect.
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