Petey



P.D., the name of a former restaurant employee, is the shooter in the season 2 episode "17 Seconds ."

History
P.D. was fired from his job at a restaurant. Shortly after this, he returns with a gun and starts shooting, as a man and a women pay at the register. He injures 14 and kills 2. He gets away and at the restaurant manager's discharge, comes to Seattle Grace and tries killing the manager, seriously injuring Burke and shooting himself in the head. He dies.