With today's sentencing of T.J. Lane, look back at other major school shootings in U.S. history.
April 19, 2007: Thirty-three people were killed in two separate shooting incidents at Virginia Tech University in Blacksburg, Va. The gunman killed himself after the second shooting, police said.
Library of Congress
Auction Team Breker
Chuck Kennedy/The White House
Boy Scouts of America
JASON REDMOND / Reuters
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