Steven Bochco Creator, Executive Producer David Milch Creator Dennis Franz Det. Sgt. Andy Sipowicz Actor Mark-Paul Gosselaar Det. John Clark, Jr. Actor Gordon Clapp Det. Greg Medavoy Actor Henry Simmons Det. Baldwin Jones Actor Bill Brochtrup John Irvin Actor Garcelle Beauvais-Nilon A.D.A. Valerie Heywood Actor Jacqueline Obradors Det. Rita Ortiz Actor John F. O'Donohue Sgt. Eddie Gibson Actor Scott William Winters Detective Stan Hatcher Guest Star Lana Parrilla Officer Janet Grafton Guest Star Ellen Geer Veronica Lewis Guest Star Stephanie Erb Susan Grady Guest Star Marc Vann Paul Grady Guest Star Taylor Sheridan Tim Lewis Guest Star Jerry Doyle Bob Longano Guest Star Jenna Lamia Gina Bell Guest Star Joshua Cox Jonathan Lemon Guest Star Bari Hochwald Martha Henstridge Guest Star Billy Concha Officer Miller Guest Star Ray LaTulipe Josh Astrachan Guest Star Mark Tinker Executive Producer, Writer, Director Bill Clark Executive Producer Nicholas Wootton Executive Producer, Writer Matt Olmstead Executive Producer