
Columbine High School Class of 1998-99.
Timeline
- Summer 1998 - Eric and Dylan begin making pipe bombs. They may have done so previously but this is when they begin to use them more frequently.
- October-November 1998 - Robyn Anderson purchases three of the four guns for Eric and Dylan at a K-Mart in Colorado.
- December 10, 1998 - Eric and Dylan film Hitmen for Hire. What may seem like a typical homemade project, was simply a rehearsal for the worse to come.
- January 1999 - Dylan's homework about a "trenchcoat killing maniac" receives controversy from one of his teachers. Dylan says "it's just a story."
- February 1999 - Philip Duran purchases the last of four guns, the TEC-9, for Eric and Dylan.
- March 6, 1999 - Eric and Dylan practice firing their weapons at Rampart Range in the mountains of Colorado.
- March 15-April 20 - Eric and Dylan film the basement tapes, video tapes showing their plans of how far they've come in beginning to take down the people they hate.
- April 17, 1999 - Columbine's senior prom is held. Dylan Klebold attends, Eric Harris does not. "Somebody" changes the date on the posters (which read "it's coming") from 4/17/99 to 4/20/99.
- April 20, 1999 - Day of the massacre, Columbine, Colorado's darkest hour.