Ritchie Coster

Since 2025, he has been part of the main cast of the CBS drama series Watson.

• Name — Ritchie Coster • Born — 1 July 1967 • Birthplace — London, England • Education — Latymer School, Edmonton Guildhall School of Music and Drama • Occupation — Actor • Years Active — 1997–present 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.

Coster has played various roles throughout his career.

• 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 Window — 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 & Order — Jorgan Stern Mark Bruner DEA 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 — Miniseries 3 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 Key • Denotes series/miniseries that have not yet been released

• Year — Title — Voice role • 2003 — Midnight Club 2 — Blog • 2007 — BioShock — Bill McDonagh