With today's deadly school shooting in Nevada, look back at other major school shootings in U.S. history.
March 5, 2001: Charles Andy Williams, 15, killed two classmates and wounded 13 people during a shooting spree at Santana High School in Santee, Calif., about 10 miles northeast of San Diego. Williams was charged as an adult and sentenced to 50 years to life in prison.
Ralf Manteufel/Wikimedia Commons
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