Mr Gibson had been shot, fighting back, in the office of Representative Tom DeLay, where the killer ran after shooting Mr Chestnut at the building's entrance.

ECONOMIST: Murder on Capitol Hill

Comedy needs momentum, and native 3-D shooting is a momentum killer.

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The killer fled and the motive for the shooting was not known, police said.

BBC: Colleagues of Bonnie Weatherall

And being very poor at shooting free-throws is a killer in any basketball, and in college basketball specifically, because games will come down to the end, and your team will need to hit free-throws to win.

NPR: Clemens Grilled on Capitol Hill

In many instances, before a mass shooting, there were people close to the killer who noticed that there may be trouble ahead.

FORBES: The Shooter: The Real Smoking Gun

Police are looking for the killer, who jumped into a blue van after the shooting on the city's South Side and drove away.

CNN: Chicago baby shot while dad changes diaper