Samuel Hengel, 15, took 23 students and a teacher hostage inside a classroom of Marinette High School for five hours. Before the hostage situation, Hengel stormed in the classroom with a handgun and fired shots at a movie projector while a movie was playing. After releasing all the hostages, police entered the building and Hengel shot himself in the head. He died the next day.
Deaths: 1, Injuries: 0