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The father of the Colorado high school debater who critically wounded a classmate before killing himself said Monday that the debate coach needed to explain why his son had planned to kill him.

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Arapahoe High School senior Karl Pierson had been disciplined in September for threats against Tracy Murphy, who had benched him over disagreement about the debate team. Friday, Pierson critically wounded a classmate and killed himself after failing to find Murphy, who is also the school librarian.

"I'm not the guy who is going to have the answers on this," Mark Pierson told theDenver Post. "Tracy Murphy is the key player."

The paper said Pierson contacted the paper to discuss the school's discipline of his son, though he would not say whether he had threatened Murphy. He said he and his ex-wife, Barbara, had been to several disciplinary hearings this year.

Murphy and school officials have not commented on the feud between the two.

Team co-captain Joe Redmond told the Post and NBC News that his friend of three years"had threatened to kill Mr. Murphy," but he could say why.

Also Monday, the Piersons issued a statement saying they were "shattered" by the violence and offered prayers 17-year-old Claire Davis, who was remains in a coma after apparently being shot randomly when Karl Pierson could not locate Murphy.

"We are shattered by the tragic events that took place on Friday at Arapahoe High School," Barbara and Mark Pierson said in a statement. "Our thoughts and prayers are with Claire Davis and her family. They, and she, have suffered unimaginably, and we pray for her full recovery."

Claire, a horse lover, babysitter and top student, remained in critical but stable condition in a coma at Littleton Adventist Hospital.

Her family released a statement late Sunday thanking emergency and medical personnel.

"The first responders got Claire to the right place, at the right time, and the doctors and hospital staff are doing a wonderful job taking care of her," the family said. "We appreciate your continued good thoughts and prayers, and will provide updates as her condition improves."

Arapahoe County Sheriff Grayson Robinson said Pierson, entered the school armed with a shotgun, Molotov cocktails and a machete with ammunition strapped to his body. Claire and Pierson were not friends, and she was shot randomly after he could not find his target, debate coach and librarian Tracy Murphy.

Pierson had read The Anarchist Cookbook, a notorious 1970s how-to manual for making explosives, and he had a grudge against Murphy, Redmond told NBC News.

"Speech and debate was his life, and the fact that he wasn't there crushed him a little bit and made him really tense and angry," said Joe Redmond.

Pierson and Murphy "did not get along, and whatever it was escalated to a death threat," he added.

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