S8, E20: Carter reads a letter from the ailing Greene to the emergency room staff and feels helpless when a terminally ill homeless man, Al Ervin (Paul Benjamin), keeps requesting Greene's help. Carter also tries to coax a drunken Abby to attend an Alcoholics Anonymous meeting with him. Meanwhile, Weaver berates a psychiatric patient. Obnoxious Pratt learns that he will be assigned to County General for his residency. And Romano struggles to save the life of a young girl, Melissa Rue (Kay Panabaker), after a dangerous malignancy is discovered during her treatment for injuries sustained in an auto accident. Mekhi Phifer and Lisa Vidal guest star.