Denis Leary Det. Mike McNeil Actor, Executive Producer, Writer Bill Nunn Det. Terrence "Pip" Phillips Actor Lenny Clarke Det. Frank Harrigan Actor Diane Farr Det. Jan Fendrich Actor Adam Ferrara Det. Tommy Manetti Actor John Ortiz Det. Ruben Sommariba Actor Julian Acosta Guest Star Keith David Guest Star Janet Hubert Guest Star Curtiss Cook Guest Star Ramsey Faragallah Guest Star Wendy Makkena Guest Star Evan Nueman Guest Star Karyn Parsons Guest Star Rory Culkin Guest Star Kellie Overbey Guest Star Harry O'Reilly Guest Star Douglas McInnis Guest Star Eunice Wong Guest Star Joshua Bitton Guest Star Peter Tolan Executive Producer, Writer, Director Lauren Carrao Executive Producer Jim Serpico Executive Producer Mike Martineau Writer Richard Dresser Writer David Walpert Writer Ann Lembeck Writer Tucker Gates Director Adam Bernstein Director