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Brennan Linsley, File, Associated Press
In this Dec. 16, 2013, file photo, Parker Semin, a 2011 Arapahoe High School graduate, prays at a makeshift memorial bearing the name of student Claire Davis, who was shot by Karl Pierson, a classmate during school three days earlier in an attack, in front of Arapahoe High School in Centennial, Colo. The father of Pierson posted a newspaper obituary for his son on the first anniversary of the shooting. The Saturday, Dec. 13, 2014 obit came the same day a candlelight vigil will be held for Davis. Mark Pierson said he didn't mean to disrespect the Davis family but wants his son, Karl, remembered as a good son who lost his way for a moment..

DENVER — The father of a student who killed a classmate at a suburban Denver high school before committing suicide posted a newspaper obituary for his son on the anniversary of the shooting, saying he forgives his son and wants him remembered as a person "who lost his way for a moment."

The Saturday obit came the same day a candlelight vigil will be held for 17-year-old Claire Davis, the girl slain in the attack.

Davis' parents couldn't be located for comment. Organizers said Davis' father, Michael Davis, planned to speak during the ceremony.

After her death, the Davis family issued a statement saying "the grace, laughter and light she brought to this world will not be extinguished by her death; to the contrary, it will only get stronger."

Mark Pierson told The Associated Press on Saturday that he didn't mean to disrespect the Davis family but wanted his son, Karl, to also be remembered for the good things he did in life. He said he did not post an obit immediately after the shooting because he felt it was not the appropriate time.

In the obituary, he called his son "a young man full of hope and promise, who lost his way for a moment, but now is found. I love you, I miss you, I forgive you." It was signed, simply, "Dad."

"I thought this was a nice tribute. He did some things right in his life. Everyone remembers Karl for the last 80 seconds of his life," Mark Pierson said Saturday. He said he also wants his son remembered as an Eagle Scout who had leadership qualities and a lot of potential.

Police say the 18-year-old targeted his debate coach when he entered Arapahoe High School with a shotgun, machete, homemade bombs and 125 rounds of ammunition on Dec. 13, 2013. He shot Davis before turning the gun on himself. The coach escaped unharmed.

School officials said they did not punish Pierson after he shouted a death threat against the coach months earlier in a school hallway. The coach was so fearful after the encounter he considered resigning, according to police reports.

But administrators deemed Pierson low-risk, despite a threat-assessment that showed a history of violent behavior and angry outbursts.

The district has declined to comment about the way it responded to the shooting, the threat or Pierson's behavioral issues.

Nearly a year later, investigators released portions of Pierson's diary in which he described himself as "a psychopath with a superiority complex" and indicated he was exacting revenge for being teased in elementary school. He said he planned the attack to start a conversation about teasing.