S5, E2: Benson (Mariska Hargitay) and Stabler (Christopher Meloni) are called to a chaotic situation at a high school. Two star basketball players are found in the gym, stripped and shot to death, and what appears to be a third victim, Joe Blaine (Rory Culkin), is shot in the head. Joe recovers, and the detectives feverishly look for the shooter. Joe draws pictures and appears to be very agitated and mentally unstable. He draws a photo that matches the school janitor (who had access to the murder weapon) but he is too aged and not agile enough to have escaped through the window, the only way for the gunman to have left the gym. But Joe's mental state is a big factor and they realize from prints he is the gunman.