one of those reports was commissioned by that attack. 17-year-old clarie davis. her parents hope to prevent another family from going through what they've gone through. claire was killed in 20-13, when a fellow student opened to prevent another family from going through what they've gone through. claire was killed in 20-13, when a fellow student opened fire inside the school. he killed her.. before turning the gun on himself. according to reports-- there were many warning signs leading up to that fateful day. at least a dozen students and teachers had complained about the shooter-- 18- year-old karl pierson. he'd threatened to kill his debate teacher just three months before the shooting. but in that case-- as in so many others-- no appropriate action was taken. we looked at information from a report by the "center for the study and prevention of violence at the university of colorado." according to that report-- on 27 occassions-- people acted in a way that kept law enforcement or school officails from preventing cheryl? demonstrators protesting the death of a m