Police Say Colorado School Shooter Wanted Revenge

(Centennial, CO) -- Authorities believe a grudge may be what drove a student to burst into a Colorado high school with a shotgun. Arapahoe County Sheriff Grayson Robinson told KMGH-TV that 18-year-old Karl Pierson was motivated by "revenge" Friday when he entered Arapahoe High School. Pierson targeted the debate instructor after he was reportedly kicked off the team. Witnesses say he asked other students about the instructor's location before shooting a 15-year-old girl.

The family of the 17-year-old girl who was shot at Arapahoe High School in Colorado is thanking the community for their love and support. Claire Davis remains in critical condition at Littleton Adventist Hospital. Arapahoe County Sheriff Grayson Robinson said that Claire was shot point blank inside the school by Karl Pierson. Robinson said Pierson came to the school fully armed and credited the on-site security for preventing any further injuries. The 18-year-old Pierson died at the scene of a self-inflicted gunshot wound.