Eric Harris, left and Dylan Klebold, right, are shown in a still photo taken from a videotape made by a cafeteria surveillance camera during the April 20, 1999 shooting rampage at Columbine High School in Littleton, Colo. The Jefferson County Sheriff's Dept. released the surveillance tape as well as the tapes the two students made during the days leading up to the massacre. (AP Photo/Jefferson County Sheriff's Dept via The Denver Post)