David awakens from a blackout to find blood and a smashed headlight on his car, and panics when he hears about a late-night hit-and-run; Tom and Ray respond to a possible kidnapping, only to find an elderly Alzheimers patient tied to a bed; as David tries to reconstruct the events of the night before, he raises the suspicions of Joel, Fearless and Ray, whose investigative abilities find the common link between the two cases.
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