Deadly school shootings in U.S. history

Published On: Apr 02 2012 04:44:44 PM CDT   Updated On: Dec 12 2014 03:44:56 PM CST

Friday's shooting at an Oregon high school injured at least three students. Look back at major school shootings in U.S. history.

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Sept. 29, 2006: Christopher Williams, 27, went to Essex Elementary School in Essex, Vt., looking for his ex-girlfriend, a teacher. He couldn’t find her, but fatally shot one teacher and wounded another. Williams also killed his ex-girlfriend’s mother. He shot himself twice in the head after the rampage and was arrested.

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