"Pekka-Eric Auvinen shot each of his victims in the head or upper body with a .22-caliber Sig Sauer Mosquito pistol as he roamed the three floors of the yellow lakeside high school, investigators said. After spraying a burst of gunfire into the cafeteria, Auvinen ended the blood bath in an adjoining restroom, where he aimed at his own skull the last bullet he fired, police said."