With today's sentencing of T.J. Lane, look back at other major school shootings in U.S. history.
T.J. Lane was sentenced today for a shooting at Chardon High School in Ohio just over a year ago that killed three students and wounded three more. Look back at other major school shootings in U.S. history.
Boy Scouts of America
JASON REDMOND / Reuters
Library of Congress
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iStock / LawrenceSawyer
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