cast
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Leonardo DiCaprio
Billy
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Matt Damon
Colin
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Jack Nicholson
Costello
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Mark Wahlberg
Dignam
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Martin Sheen
Queenan
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Ray Winstone
Mr. French
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Vera Farmiga
Madolyn
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Anthony Anderson
Brown
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Alec Baldwin
Ellerby
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Kevin Corrigan
Cousin Sean
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James Badge Dale
Barrigan
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David O'Hara
Fitzy
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Mark Rolston
Delahunt
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Robert Wahlberg
Lazio (FBI)
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Kristen Dalton
Gwen
- Thomas B. Duffy Govenor
- Richard Hughes Uncle Edward
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J.C. MacKenzie
Realtor
- Mary Klug Billy's Aunt
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Peg Holzemer
Mrs. Kennefick
- Robert 'Toshi' Kar Yuen Chan Triad Boss
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Gurdeep Singh
Pakistani Proprietor
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Armen Garo
Providence Gangster #1
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John Cenatiempo
Providence Gangster #2
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Joseph Riccobene
Kneecapped Bankrobber
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Billy Smith
Detective #1 Tailing Queenan
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Lyman Chen
Translator
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Kevin P. McCarthy
Detective #1 - Colin's Unit
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Chris Fischer
Detective #2 - Colin's Unit
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Brian Smyj
Man Glassed in Bar
- William Severs Older Priest
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Larry Mitchell
Younger Priest
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Anthony Estrella
Police Camera Tech
- Andrew Breving Police Cell Phone Tech
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Tracey Paleo
Darlene the Secretary
- Douglas Crosby Man Killed by French
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Dorothy Lyman
Woman at Bar #1
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Audrie Neenan
Woman at Bar #2
- Frank Mallicoat News Anchor
- Paula DeMers Billy's Mother
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Conor Donovan
Young Colin
- Amanda Lynch Carmen
- Sallie Toussaint Woman at Opera
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Patrick Coppola
Bookie Harassed by French
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Mick O'Rourke
Jimmy Bags
- Deborah Carlson Sister Mary Theresa
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Nellie Sciutto
Queenan's Secretary
- Peter Welch Other Prisoner
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Henry Yuk
Chinese Government Man
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Dennis Lynch
Costello's Crew #1
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Michael Byron
Costello's Crew #2
- William Lee Costello's Crew #3
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John Rue
Luncheonette Proprietor
- Peter Crafts Man in Costello's Bar
- Joseph P. Reidy Priest w/ Young Colin
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John Farrer
Priest at Billy's Funeral
- Paris Karounos Jimmy Pappas
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Brian Haley
Detective #2 Tailing Queenan
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Terry Serpico
Detective #3 Tailing Queenan
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Jay Giannone
Detective #4 Tailing Queenan
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John Polce
Lynn Detective
- Bo Cleary Drill Instructor #2 (voice)
- David Conley Gang Member with Mr. French
- Victor Chan Chinese Delivery Man
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Jill Brown
Executed Woman
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Sarah Fearon
French's Wife
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Denece Ryland
Woman Doctor
- Daniel F. Risteen, Jr. Crack House Cop #1
- Francis P. Hughes Crack House Cop #2
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Johnny Cicco
Crack Addict
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Chance Kelly
Exam Instructor
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Shay Duffin
Bartender at Brasserie
- John McConnell Bookie in Costello's Bar
- Kenneth Stoddard State Trooper #1
- Jeffrey Winter State Trooper #2
- Paddy Curran New Guy
- Mark Philip Patrick New Guy
- David Fischer Executed Man
- Walter Y.F. Wong Waiter in Alley
- Tony M. Yee Waiter in Alley
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Francesca Scorsese
Little Girl at Airport
- Alex Morris Young Man at Airport
- Emma Tillinger Koskoff Woman with Dog
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Craig 'Radio Man' Castaldo
Crack House Denizen
- Takumi Bando Triad (uncredited)
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Eric Bruno Borgman
Reporter (uncredited)
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Brendan Burke
Irish Thug (uncredited)
- Chris Chinn Gang Member (uncredited)
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Jeffrey Corazzini
Crime Scene Unit (uncredited)
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Jim Ford
Cadet (uncredited)
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Trudi Goodman
Woman Office Worker (uncredited)
- Steve Lord Academy Pistol Coach (uncredited)
- Jack McCullough EMT (uncredited)
- Osmani Rodriguez Reporter (uncredited)
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Lawrence Cameron Steele
Academy Firearms Instructor (uncredited)
- Conor Timmis Rugby Fan (uncredited)
- Joseph Oliveira Officer (uncredited)
- Adam Masnyk Southie Teen / Soccer Player (uncredited)
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John Franchi
Pedestrian (uncredited)
- Paul McGillicuddy Subway Passenger (uncredited)
- Kim Carrell MA State Police Detective
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Rebecca Love
Adult Film Actress (uncredited)