Deadly school shootings in U.S. history

Published On: Apr 02 2012 02:44:44 PM PDT   Updated On: Nov 19 2014 01:28:22 PM PST

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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