Shooting Suspect Identified in Colorado

He critically wounded a classmate before killing himself

One teen was wounded and two others suffered minor injuries Friday at a suburban Denver high school after a fellow student seeking revenge against a teacher opened fire with a shotgun before taking his own life, authorities said.

The shootings — on the eve of the anniversary of the Newtown school massacre, in which 20 students and six staffers were murdered — sent scores of terrified students and staffers at Centennial's Arapahoe High School scurrying at about 12:30 p.m. Police and other first responders quickly mobilized to surround the 2,220-student school. …

Sheriff Robinson identified the student who opened fire in Colorado school as Karl Halverson Pierson, 18.