High School Shooter Wanted Payback for Teasing

Oct 11, 2014 03:37 AM EDT

(Photo : Reuters) Students gather and reunite with their parents at a fast food joint across from Arapahoe High School, after a student opened fire in the school in Centennial, Colorado December 13, 2013. The student seeking to confront one of his teachers opened fire at the Colorado high school on Friday, wounding at least two classmates before apparently taking his own life, law enforcement officials said.

The diary of the student who fatally shot a classmate at a Denver high school, then subsequently committing suicide, revealed that the shooter described himself as "a psychopath with a superiority complex". Furthermore, the piece of evidence disclosed that the suspect intended to exact vengeance following the bullying he went through during his elementary school days.

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Investigators shared that the 18-year-old shooter, Karl Pierson, stated in his diary that the purpose of his Dec. 13 attack was to initiate a discussion centered on elementary school teasing.

"Words hurt, can mold a sociopath, and will lead someone a decade later to kill," the Arapahoe High School shooter wrote in the document he entitled "A diary of a madman."

In accordance with investigating officers, Pierson intended to exact revenge against his debate coach, Tracy Murphy, when he went to school carrying a machete, a shotgun, 125 rounds of ammunition, and home-made explosives.

Pierson's attack resulted in the death of Claire Davis, 17, who was then sitting with one of their classmates along the hallway of the school. The shooter then took his own life inside the school library when the security officers were said to be closing in on him.

School authorities first became aware of Pierson's plan on Sept. 3 when a staffer heard him threatening Murphy in the school parking lot after the latter replaced him with another student as debate team captain. Despite this report, however, Pierson was not classified as a dangerous person by the school.

Two days after the threats were overheard, a school resource officers, who also works as a deputy of the sheriff, reported the incident. Sheriff Dave Welcher, however, refused to investigate the report as Pierson committed no crime.

"That was left in the hands of the school district," Welcher claimed.

Murphy got through the incident unscathed.

TagsDenver, Karl Pierson, psychopath, Murder, shooting, diary, Arapahoe High School, Tracy Murphy, Claire Davis, machete, Shotgun, bombs, Explosives