who is the actor that plays the grandfather on blue bloods
Len Cariou Leonard Joseph "Len" Cariou (born September 30, 1939) is a Canadian actor, best known for his portrayal of Sweeney Todd in the original cast of Sweeney Todd: The Demon Barber of Fleet Street, for which he won the Tony Award for Best Actor in a Musical, and for playing the patriarch Henry Reagan, NYPD Police Commissioner (retired), in the multi-generational television series Blue Bloods on CBS.