With today's deadly school shooting in Nevada, look back at other major school shootings in U.S. history.
Sept. 2, 2006: Douglas W. Pennington, 49, killed himself and his two sons, Logan P. Pennington, 26, and Benjamin M. Pennington, 24, during a visit to the campus of Shepherd University in Shepherdstown, W. Va.
Warner Bros. Pictures
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