With today's deadly school shooting in Nevada, look back at other major school shootings in U.S. history.
May 1, 1992: Eric Houston, 20, kills four people and wounds 10 at his former school, Lindhurst High School in Olivehurst, Calif. Prosecutors said the attack was in retribution for a failing grade. Houston was convicted and sentenced to death.
Seoul National University/Handout/Reuters
Lucy Richardson/ Reuters
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