A couple visits the memorial crosses dedicated to the the 13 people killed in the 1999 Columbine High School shooting attack, at Chapel Hill Memorial Gardens in Littleton, Colo., Easter Sunday, April ... more 
A couple visits the memorial crosses dedicated to the the 13 people killed in the 1999 Columbine High School shooting attack, at Chapel Hill Memorial Gardens in Littleton, Colo., Easter Sunday, April 20, 2014. April 20th marks the 15th anniversary of the massacre at Columbine High School, where 12 students and a teacher were killed. (AP Photo/Brennan Linsley) less 
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Associated Press | Photo By Brennan Linsley
Sun, Apr 20, 2014 3:15 PM EDT