Eric Harris, 18, and Dylan Klebold, 17, entered the Columbine High School in Littleton, Colorado, on April 20, 1999, school wearing trench coats and shot 12 students and one teacher before killing themselves.
The dorks, the loners, the outcasts that killed 13 people at Columbine High School in 1999 pennlive.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from pennlive.com Daily Mail and Mail on Sunday newspapers.