Deadly school shootings in U.S. history

Published On: Apr 02 2012 04:44:44 PM CDT   Updated On: Jun 10 2014 11:18:04 AM CDT

With Tuesday's school shooting in Oregon, look back at other 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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