The following diagrams show the significant events and movements of Eric Harris and Dylan Klebold on April 20, 1999. The witnesses to each event are shown as green dots. The injured are shown as yellow only during the event that caused the injury and return to green if they witnessed other events. The deceased are shown as red and convert to gray once that event has passed. Harris is shown as a red dot with the letter “H” inside it and Klebold is shown as a blue dot with the letter “K” inside it. The diagrams only show the portions of the school where the events are occurring. Where appropriate an overview of the school is shown with a red square indicating what area of the school is magnified. Harris and Klebold are not shown on every diagram, but rather only during the events that witnesses actually observed them.
Andrew Mccoy
Published Apr 12, 2026
TABLE OF CONTENTS
The following listing will allow the reader to navigate through the report and obtain details for activities that occurred around the Columbine High School incident. Utilize the forward and backward buttons provided within your internet browser to move backward when no specific links are provided on pages. INSTRUCTIONS / OPERATING HELP
TIME LINES
From the beginning of the investigation into the shootings at Columbine High
School, a timeline was established to record the significant events of April 20,
1999. The
timeline was updated several times as new information became available from all
the different sources. The result is a PRIMARY Timeline, which offers a brief chronological
account of the events of April 20, 1999, the movements of Eric Harris and Dylan
Klebold, the law enforcement and emergency responses and the media coverage. This timeline is the basis for a more detailed, comprehensive NARRATIVE
timeline of the April 20 events that is included in this report.
Narrative time line of the events
CRIME SCENE DIAGRAMS
DETAILED INFORMATION
FIRST RESPONDERSSUPPORT RESPONSETHE INVESTIGATIONLARGER COMMUNITY RESPONSEEXPLOSIVE RESPONSEMANAGEMENT STRUCTURE
PHOTOGRAPHS
GENERAL INFORMATION
AUDIO
JCSO utilizes Channel #1 for primary communications to the deputies on the street. Channel #2 is used for command, tactical operations and two way communications. When names, addresses or phone numbers were given they have been removed from the tapes and you will hear silence.
RIGHT CLICK CURSOR OVER PHOTO TO START AUDIO - CLICK STOPBUTTON ON TOOL BAR TO STOP AUDIO
VIDEO
LEFT CLICK TO DOWNLOAD THE VIDEO CLIPS - CLICK STOP BUTTON ON TOOL BAR TO STOP VIDEO
