RELATED STORY | Father who gave gun to Apalachee High School shooter sentenced to serve 15 years in prisonThe boy also killed his grandparents at the home he shared with them prior to the school shooting, Polapee said. Prime Minister Anutin Charnvirakul, speaking after touring the school, confirmed reports that the shooter was 14 and had killed himself. He said the student had shown signs of stress connected to school. Police find grandparents dead at family homeAfter the shooting, police went to his home and found both grandparents dead of apparent gunshot wounds, regional police Commander Wattana Yeejeen said. The student appeared to have shot them before attending school as normal.