All Cassie Pictures

LITTLETON, CO - APRIL 20: Jake Schreck, 25, of Littleton sits atop Rebel Hill reflecting on the ten-year anniversary of the Columbine High School shootings at the Columbine Memorial Park April 20, 2009 in Littleton, Colorado. Schreck was a freshman at the school the day of the shootings and said he could hear gunshots as he was trapped in the auditorium that day with other students. He was also friends with shooting victim Cassie Bernall's brother, Chris. Columbine was the site of the then deadliest school shooting in modern United States history when, on April 20, 1999, Eric Harris and Dylan Klebold killed 12 students and one teacher, and wounded 23 others, before taking their own lives. (Photo by Marc Piscotty/Getty Images)