Original executive producers John Wells and Michael Crichton reprised their roles.

Randolph Mantooth as Policeman at school.

Michelle Bonilla as Paramedic Christine Harms.

Lyn Alicia Henderson as Paramedic Pamela Olbes.

Montae Russell as Paramedic Dwight Zadro.

Emily Wagner as Paramedic Doris Pickman.

Jeff Cahill as Transport Dispatcher Tony Fig.

Troy Evans as Desk Clerk Frank Martin.

Kristin Minter as Desk Clerk Miranda 'Randi' Fronczak.

Erica Gimpel as Social Worker Adele Newman.

Morris Chestnut as ICU Nurse Frank 'Rambo' Bacon.

Conni Marie Brazelton as Nurse Conni Oligario.

Donald Anspaugh – Surgical Attending Physician, Hospital Board Member Janet Coburn – Chief of Obstetrics and Gynecology Jing-Mei Chen – Resident PGY-3 (episodes 10-22) Dave Malucci – Resident PGY-2 (episodes 2-22)

Maura Tierney as Abby Lockhart – Third-year Medical Student (episodes 12-22).

Robert Romano – Chief of Staff and Surgery

Kellie Martin as Lucy Knight – Fourth-year Medical Student (episodes 1-14).Elizabeth Corday – Associate Chief of Surgery

Kerry Weaver – Chief of Emergency Medicine

Gloria Reuben as Jeanie Boulet – Physician Assistant (episodes 1-6).

Julianna Margulies as Carol Hathaway – Nurse Manager (episodes 1-21).

Carter then accepts that he's an addict and checks into a rehab in the season finale with Benton accompanying him.

While still recovering from the violent attack that left him near death and killed Lucy, Carter develops an addiction to pain medication, forcing Greene, Chen, and Weaver along with Benton and the other doctors into an intervention to get Carter to realize that he's an addict.

Abby Lockhart begins her third-year-med-student rotation. Greene and Corday begin their relationship and he deals with the death of his father. Hathaway struggles to begin parenting on her own, then decides to leave Chicago to begin a new life with Doug Ross. In addition Croatian doctor Luka Kovač joins the team and struggles to gain the respect and trust from his new colleagues in the ER. Despite everyone's best efforts, they are unable to save Lucy who succumbs to her wounds and dies. The ER staff work to save Carter and Lucy. Lucy Knight and John Carter are attacked and stabbed by a psychotic patient. Physician Assistant Jeanie Boulet leaves to care for her HIV-positive child. Paul McCrane's Robert Romano is now billed as a series regular and we also see the return of Deb Chen from season one, now preferring to be called Dr. Luka Kovač nurse, later third-year medical student, Abby Lockhart Dr. In the first major cast change in ER, the sixth season sees the addition of four new characters: Dr.

Er cast season 1