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 Chandra West Dr. Jennifer Devlin Guest Star Ron Dean Joe Brockhurst Guest Star Francis X. McCarthy Gerald Clifton Guest Star Bruce A. Young Leonard Peeler Guest Star Lorinne Vozoff Sharon Clifton Guest Star Dakin Matthews Simon Clifton Guest Star Lance Guest Mercy Hawks Guest Star Robin Weigert Donna Traylor Guest Star Leo Marks Sam Jeffers Guest Star Jessalyn Gilsig Detective Kelly Ronson Guest Star Mark Brady Ken Uggams Guest Star Mike Sabatino Uniform 1 Guest Star Betty A. Bridges Clara Peeler Guest Star Lisa Marie Jabboury Lisa Guest Star Laura Milby Enthralled Woman Guest Star Bob Margitich EMS Guest Star Mark Tinker Executive Producer, Director Bill Clark Executive Producer, Writer Nicholas Wootton Executive Producer Matt Olmstead Executive Producer, Writer