26/02/19921992Brooklyn, New York, United StatesNew York20Thomas Jefferson High School was the scene of its second shooting of the school year, when a 15-year-old shot and killed two other students. The shooter, Khalil Sumpter, is sentenced in 1993 to between 6 2/3 and 20 years in prison and is released in 1998."Facts about school violence in the U.S.". policeacademyu.com. Retrieved December 12, 2014.