Ritchie Coster (born 1 July 1967) is an English character actor. He is best known for playing the roles of Dietrich Banning in The Tuxedo (2002), the Chechen in The Dark Knight (2008), Elias Kassar in Blackhat (2015), Mayor Austin Chessani on the second season of the HBO anthology television series True Detective, and Francisco Scaramucci/Mr. Blue on the SyFy television series Happy! Since 2025, he has been part of the main cast of the CBS drama series Watson.
Career
Coster has played various roles throughout his career. Coster worked as a Barman in the early 90s at the Rock Island Diner in London's Piccadilly Circus before leaving to concetrate on acting. While in America he was an understudy to Quentin Tarantino in a show.
Filmography
Film YearTitleRoleNotes1999The Thomas Crown AffairJanos2000The Photographer Attacker #1BaitBuyer200115 MinutesNews Stand Vendor2002Pipe DreamPascalThe TuxedoDietrich Banning2006The SentinelThe Handler2007American GangsterJoey Sadano2008The Dark KnightThe Chechen2010The Bounty HunterRayLet Me InMr. ZoricPete Smalls Is DeadHal Lazar2014By the GunTony MatazanoRoseSamuelShort film2015BlackhatElias KassarCreedPete Sporino2016The Great & the SmallRichie2017SubmissionDean Bentham2019The BygoneBeckett Summer2021After YangRuss2024King IvoryMickey Greene
Television Year Title Role Notes 1997 Dellaventura Episode: "Hell's Kitchen" 1997–1998 New York Undercover Keith Draper and Flannagan 2 episodes 1998 F/X: The Series Jimmy Hickman Episode: "Reaper" Rear WindowLakeland Ledger 22 November 1998 Page 74. Reeve's Acting Career Back on Course by Suzanne Gill Julian Thorpe TV movie 1999 Law & Order: Special Victims Unit Carlo Parisi Episode: "...Or Just Look Like One" Third Watch Rudy Episode: "Sunny, Like Sunshine" 2000 Sex and the City Caleb McDougal Episode: "Don't Ask, Don't Tell"Credited as Richie Coster 2000–2001 As the World Turns Gabriel Frank Unknown episodes 2000–2006 Law & OrderTV Guide Ritchie Coster Celebrity Jorgan SternMark BrunerDEA Agent Kevin Almonte 3 episodes 2002–2009 Law & Order: Criminal Intent Simon Matic and Jack Taylor 2 episodes 2002 HBO First Look Himself Episode: "'The Tuxedo': Tailor Made for Jackie Chan" 2003 Hack Nick Trepov 2 episodes 2004 Traffic Fazal Miniseries3 episodes With God on Our Side: George W. Bush and the Rise of the Religious Right in America Himself (Narrator) TV movie 2005 Jonny Zero Garret / Garrett Series regular; 10 episodes Law & Order: Trial by Jury Shane Lucas Episode: "Skeleton" 2005–2006 Guiding Light Nate / Alfred 4 episodes Beautiful People Tyler Lustig 3 episodes 2006 Kidnapped Bradwell Scott Episode: "Sorry, Wrong Number" 2008 John Adams Captain Preston Episode: "Join or Die"; Miniseries CSI: Crime Scene Investigation Arthur Blisterman Episode: "Art Imitates Life" 2009 Virtuality Dr. Jimmy Johnson TV movie 2011–2012 Luck Renzo Series regular; 9 episodes 2011 Person of Interest Assassin Episode: "Ghosts" 2012 Luck: A Day at the Races Himself TV movie 2013 The Blacklist Anslo Garrick 2 episodes 2014 Babylon Fields Ernie TV movie 2015 HBO First Look: Blackhat Himself TV movie Blackhat: On Location Around the World Himself Documentary video Blackhat: Creating Reality Himself Documentary video True Detective Mayor Austin Chessani 7 episodes 2017 Billions Donald Thayer 3 episodes Shades of Blue Michael Bianci 7 episodes 2017–2019 Happy! Francisco "Mr. Blue" Scaramucci, Orcus Main role 2020 The Flight Attendant Victor 3 episodes 2021 The Walking Dead Pope 4 episodes 2022–2023 Tulsa King Caolan Waltrip 7 episodes 2025–2026 Watson Shinwell Johnson Main cast +KeyDenotes series/miniseries that have not yet been released
Video games YearTitleVoice role2003Midnight Club 2Blog2007BioShockBill McDonagh
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