With Tuesday's school shooting in Oregon, look back at other major school shootings in U.S. history.
Aug. 28, 2000: James Easton Kelly, 36, a University of Arkansas graduate student recently dropped from a doctoral program after a decade of study, and John Locke, 67, the English professor overseeing his coursework, are shot to death in an apparent murder-suicide.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
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