Eric Harris & Dylan Klebold
"The Columbine High School Massacre"
Eric Harris's father (Wayne Harris) was a former Air Force pilot stationed at Plattsburgh AFB in New York, rumored to be linked to covert operations such as mind control.
The family subsequently moved to Littleton CO in 1993, and Wayne Harris took a job at FlightSafety Services in Englewood CO, a company rumored to work closely with Lockheed Martin that offered pilot training and flight simulation software.
These two rumors obviously don't equal a truth, but it's quite possible that Harris was close to the military-industrial complex and intelligence community.