S6, E14: Irritated by a raucous Valentine's Day party in the admittance area as she comes on duty, Weaver attends to a few situations before entering the horrifying examination room where Carter and Lucy lie in massive amounts of blood, almost dead from numerous stab wounds. The police close off the crime scene and search the premises for the presumed attacker, Lucy's schizophrenic patient, Paul Sobriki, whom they later apprehend. With Anspaugh's help, Benton successfully performs surgery on Carter. After her life-saving surgery, Lucy dies from a pulmonary embolism.