With today's sentencing of T.J. Lane, look back at other major school shootings in U.S. history.
April 20, 1999: Students Eric Harris, 18, and Dylan Klebold, 17, killed 12 students and a teacher and wounded 23 before killing themselves at Columbine High School in Littleton, Colo.
Courtesy of BaconBros.com
iStock / digitalskillet
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