Denis Leary Tommy Gavin Actor, Writer 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 Dean Winters Johnny Gavin Actor Kate Burton Guest Star Paige Turco Guest Star Robert John Burke Guest Star Lenny Clarke Guest Star Tatum O'Neal Guest Star Peter Tolan Executive Producer, Director, Writer Jim Serpico Executive Producer Kerry Orent Producer