Tommy Gavin

Denis Leary

Jimmy Keefe

James McCaffrey

Franco Rivera

Daniel Sunjata

Mike Silletti

Michael Lombardi

Janet Gavin

Andrea Roth

Lt. Kenny `Lou' Shea

John Scurti

Sean Garrity

Steven Pasquale

Chief Jerry Reilly

Jack McGee

Sheila Keefe / —

Callie Thorne

Guest Star

Matthew Arkin

Guest Star

Jimmy Burke

Guest Star

Ashlie Atkinson

Guest Star

Kristina Apgar

Chief 'Needles' Nelson

Adam Ferrara

Guest Star

Bruce Altman

Guest Star

George Bartenieff

Guest Star

Susan A. Ashton

Guest Star

Todd Carroll

Guest Star

Patricia Velasquez

Guest Star

Peter Bradbury

Guest Star

Julie White

Guest Star

Gerry Bamman

Guest Star

Lisa Barnes

Guest Star

Julie Boyd

Guest Star

Michael Mulheren

Guest Star

Jessica Blank

Guest Star

Siobhan Fallon Hogan

Guest Star

Arthur S. Brown

Guest Star

Bryan Batt

Guest Star

Paula Devicq

— / Johnny Gavin

Dean Winters

Guest Star

James Badge Dale

Guest Star

Robert John Burke

Guest Star

Anthony Mangano

Guest Star

Lenny Clarke

Guest Star

Charles Durning

Guest Star

Olivia Crocicchia

Guest Star

Natalie Distler

Guest Star

Michael Carlsen

Guest Star

Robert Clohessy

Guest Star

Dinarte de Freitas

Guest Star

Tony Cox

Guest Star

Ned Eisenberg

Guest Star

Jay Potter

Guest Star

Mackenzie Connolly

Guest Star

Kevin Hagan

Guest Star

Diane Farr

Bart 'Black Shawn' Johnston

Larenz Tate

Guest Star

Curtiss Cook

Guest Star

Ed Sullivan

Guest Star

Joseph Murphy

Maggie Gavin

Tatum O'Neal

—

Kate Burton

Guest Star

Michael Zegen

—

Milena Govich

—

Neal Jones

—

Timothy Adams

—

Patti D'Arbanville

Alicia Green

Susan Sarandon

—

Greg D'Agostino

—

Sherri Saum

—

Jarah Mariano

—

Karen Goberman