Fitzy (as David Patrick O'Hara)
Mrs. Kennefick (as Peg Saurman Holzemer)
Triad Boss (as Robert Chan)
Detective #1 Tailing Queenan
Detective #1 - Colin's Unit
Detective #2 - Colin's Unit
Woman at Bar #2 (as Audrie Neenan)
Bookie Harassed by French
Costello's Crew #3 (as Billy Lee)
Priest with Young Colin (as Joseph Reidy)
Priest at Billy's Funeral
Detective #2 Tailing Queenan
Detective #3 Tailing Queenan
Detective #4 Tailing Queenan
Lynn Detective (as John J. Polce)
Drill Instructor #2 (voice)
Gang Member with Mr. French
Billy Costigan, Sr. (credit only)
Young Billy (credit only)
Bookie in Costello's Bar (as John M. McConnell)
Waiter in Alley (as Walter Y.F. Wong)
Crack House Denizen (as Craig 'Radioman' Castaldo)
Undercover Drug Agent (uncredited)
Donegan - Police Cadet (uncredited)
Driver of Car in Chase (uncredited)
Crime scene unit (uncredited)
Police Officer (uncredited)
State Police Detective (uncredited)
Woman Office Worker (uncredited)
College Student (uncredited)
Academy Pistol Coach (uncredited)
Cadet Parent (uncredited)
State Trooper (uncredited)
Construction Worker (uncredited)
Forensics Officer (uncredited)
Academy Firearms Instructor (uncredited)
Shopper in China Town (uncredited)
Cadet Parent (uncredited)
