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Karl Pierson, 18, critically wounded a student before apparently killing himself Friday at Arapahoe High School as police moved in. His body was found about a half-hour after the shooting was reported.
Steve Miles, an English teacher who taught Pierson as a freshman, said Saturday that the school librarian who ran the speech team cut Pierson from the team, but he didn't know why.
"I think he (Pierson) really cultivated his speech and argument skills and really thought that was a big part of his identity. ... He probably thought it was a pretty crushing blow to get kicked off the debate team," Miles said.
It's unclear whether the librarian was the person Pierson was searching for when he entered the school with a gun. Authorities haven't identified Pierson's target, but students say the librarian was the one he was seeking. Sheriff Grayson Robinson has described the target as a teacher.
"Our initial investigation is causing us to believe that this shooting was the result of revenge on the part of the shooter because of a confrontation or a disagreement between the shooter and the teacher," Robinson said.
Senior Dillon Johnson, 17, said he thinks that when Pierson lost his platform to share his passionate views through the debate team, it "set him off."
Students described Pierson as an outspoken, sometimes goofy and smart student who often would talk about his beliefs during class, sometimes even debating his teachers. They also said he was an Eagle Scout who finished at the top of speech competitions.
Pierson competed in extemporaneous speaking — in which students prepare short speeches on current events — in the National Forensic League's national tournament in June in Birmingham, Ala. He didn't advance to the elimination rounds, the league said.
This year's yearbook also listed him as being a member of the cross-country team.
Students said Pierson held communist views and liked to discuss current events and issues, offering his own solutions. None said Pierson was bullied for his beliefs.
"He would speak for himself. He would not be afraid to tell someone how he feels," said Zach Runberg, 18, a fellow senior who had an English class with Pierson.
"People would talk to him, nice conversations," Runberg. "He's a nice, funny kid. He had some good, intelligent jokes."
The investigation unfolded as students raised money to pay for the medical care of the wounded student. She hasn't been identified, but friends posted prayers and comments for her on Twitter under #prayforClaire.
A fundraising poster was set up on a fence at the school as students returned to pick up their cars left behind during the shooting.
Senior Chris Davis said he helped organize the effort in hopes of helping his classmates and the larger community heal. The poster read "Warriors always take care of one another," an unofficial school saying often referenced during morning announcements. Many students also posted the motto on social media pages.
"I feel like it's going to make us a stronger senior class and school as a whole," Davis said. "Everyone went through it, and we all know people experienced it in their own way, and we just need to be there for everybody."
Davis, whose locker is right next to the victim's, described her as someone who loves horses, has a lot of friends and always seems happy. He planned to visit her at the hospital Saturday night.
Pierson, whose parents were divorced, lived at least part of the time with his mother in a higher-end neighborhood in suburban Highlands Ranch. The home and others have three-car garages, and a country club is nearby. The front door of the home was covered with plywood Saturday after authorities conducted a search overnight.
Challon Winer, who lives across the street from Pierson's home, said he often would see the teen mowing the lawn or shoveling snow from the driveway.
"I noticed that he didn't look extremely happy, but he was a teenager," subject to the normal moods of that age group, Winer said.
In recent days the teen's schedule appeared to change, and he left the house a little later than usual, Winer said.
Winer said Pierson's mother, Barbara Pierson, has worked with the Neighborhood Watch group and sometimes sent emails reminding residents about safety precautions. "She seemed aware of what was going on," Winer said.
He said he had occasional neighborly chats with Barbara Pierson but didn't know the family well.
Following the shooting, authorities evacuated hundreds of students in an orderly procession — a demonstration of aggressive security measures developed by police and schools following the 1999 shooting at Columbine, some 8 miles west of Arapahoe High.
After that tragedy, police across the country developed "active shooter" training in which responding officers rush toward gunfire — stepping over bodies and bleeding victims if necessary — to stop the gunman.
Before Columbine, officials followed a contain-and-wait strategy in which arriving officers set up a perimeter to contain the situation, then wait for SWAT team members trained in military tactics to bring down the gunman.
The Arapahoe shooting came a day before the one-year anniversary of the Newtown, Conn., attack in which a gunman killed 20 children and six adults at Sandy Hook Elementary School. About 200 people, including relatives of the victims of last year's Aurora theater shooting, gathered in a park in Denver to remember those killed in Newtown.
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