With today's sentencing of T.J. Lane, look back at other major school shootings in U.S. history.
In December 2012, gunman Adam Lanza massacred 20 first-graders and six staff membesr at Sandy Hook Elementary School in Newtown, Conn. He shot his mother to death before going to the school, and killed himself as authorities arrived.
Courtesy of BaconBros.com
iStock / digitalskillet
Warner Bros. Pictures
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