11 of 21
Episodes: "Sanctuary," "Death and All His Friends," "These Arms of Mine" and "That's Me Trying"
Mary Portman (Moore) is a tragic case of wrong place, wrong time. She comes to Seattle Grace for a colostomy reversal — on the same day that Gary Clark rampages through the hospital. After Clark shoots Dr. Percy in her bathroom, Mary helps Bailey try to save him, but to no avail. When Mary returns to the hospital six months later for the surgery, she never wakes up and is eventually taken off life support.