Deadly school shootings in U.S. history

Published On: Apr 02 2012 04:44:44 PM CDT   Updated On: Nov 27 2014 11:21:46 AM 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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Aug. 15, 1998: Frederick Martin Davidson, 36, a graduate engineering student at San Diego State University, was defending his thesis before a faculty committee when he pulled out a handgun and killed three professors.

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