Denis Leary Tommy Gavin Actor James McCaffrey Jimmy Keefe Actor Andrea Roth Janet Gavin Actor Michael Lombardi Mike Silletti Actor Jack McGee Chief Jerry Reilly Actor Steven Pasquale Sean Garrity Actor Daniel Sunjata Franco Rivera Actor John Scurti Lt. Kenny "Lou" Shea Actor Callie Thorne Sheila Keefe Actor Natalie Distler Colleen Gavin Actor Robert John Burke Mick Gavin Actor Lenny Clarke Teddy Gavin Actor Dean Winters Guest Star Jay Potter Guest Star Jimmy Burke Guest Star Ed Sullivan Guest Star Joseph Murphy Guest Star Michael Zegen Guest Star Peter Tolan Executive Producer Jim Serpico Executive Producer Kerry Orent Producer John Fortenberry Director Jace Alexander Director Adam Bernstein Director