With today's deadly school shooting in Nevada, look back at other major school shootings in U.S. history.
Oct. 1, 1997: Sixteen-year-old Luke Woodham of Pearl, Miss., fatally shot two students and wounded two others at Pearl High School after stabbing his mother to death. He was sentenced the following year to tow life sentences.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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