With today's deadly school shooting in Nevada, look back at other major school shootings in U.S. history.
Jan. 16, 2002: Appalachian School of Law graduate student Peter Odighizuwa, 42, who had recently been dismissed from the school, returned to campus and killed the dean, a professor and a student before being tackled by students. The attack also wounded three female students.
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Fred Prouser/Danny Moloshok/Reuters
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