Leonard Joseph “Len” Cariou (born September 30, 1939) is a Canadian actor. He gained prominence for his Tony Award-winning title role in the original cast of Sweeney Todd: The Demon Barber of Fleet Street (1979). Prior, Cariou had earned nominations for his performances in musicals Applause (1970) and A Little Night Music (1973). Cariou has had supporting roles in films such as The Four Seasons (1981), Thirteen Days (2000), About Schmidt (2002), Flags of Our Fathers (2006), Prisoners (2013), and Spotlight (2015). On television, he is known for recurring roles in the shows Murder, She Wrote (1985–1992), Brotherhood (2005-2006), and Damages (2010) and his starring role in Blue Bloods (2010–2024).