Craig F. Walker, The Denver Post
In this April 30, 1999, file photo, 15 crosses honor those that died in the Columbine High School shooting on a hill at Clement Park. 
Getting your player ready...
As the 20th anniversary of the deadly Columbine High School shooting approaches, The Denver Post takes a look back at the aftermath of the April 20, 1999, massacre and what has happened in the decades since.