With today's sentencing of T.J. Lane, look back at other major school shootings in U.S. history.
Dec. 1, 1997: Three students were killed and five wounded at West Paducah High School in West Paducah, Ky. Michael Carneal, then 14, later pleaded guilty but mentally ill to murder and is serving life in prison.
Library of Congress
Auction Team Breker
Chuck Kennedy/The White House
Boy Scouts of America
JASON REDMOND / Reuters
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