ER DOCTORS STRUGGLE WITH SCHOOL SHOOTING TRAUMAS IN SEASON FINALE -- Dr. Kovac (Goran Visnjic) crosses swords with Benton (Eriq La Salle) over prioritizing care for a young victim (guest star Kyle Sullivan) of a deadly school shooting versus a more seriously wounded gunman (guest star Michael Johnson). Benton and Dr. Corday (Alex Kingston) share a moment of mutual triumph when they successfully complete a risky but life-saving surgical procedure on a wounded student from the schoolyard. Kovac's draining day continues when he attempts to browbeat a teenaged stabbing victim (guest star Emily Bergl) into allowing him to birth her unwanted and unborn baby despite her adamant wishes to let the child die. A combative Dr. Carter (Noah Wyle) is confronted by Dr. Greene (Anthony Edwards) and the other ER doctors over his behavior since being attacked. Greene tries to convince a hardy rugby player (guest star Stewart Finley-McLennan) that his injuries are more serious than he thinks. Laura Innes, Michael Michele, Paul McCrane, Erik Palladino, Ming-Na and Maura Tierney also star. - From NBC