In 2013, Chicago newspapers and television stations kept a daily deadly count, listing those slain each day, most by gun violence. One of the most noted occurred early in the year when Hadiya Pendleton, 15, was shot and killed about a week after performing at inauguration events in Washington, D.C., with her high school band.
A Colorado high school student with an apparent grudge against a teacher wounded a classmate with a shotgun before killing himself, chilling a state that's still trying to make sense of mass shootings at Columbine High School and an Aurora movie theater.
Quick-thinking students at Arapahoe High School on Friday alerted the targeted teacher, who quickly left the building. Police immediately locked down the scene on the eve of the Newtown massacre anniversary — a somber reminder of how commonplace school violence has become.