shootings

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A former biology professor accused of pulling a gun from her purse and opening fire at a faculty meeting pleaded guilty Tuesday to killing three colleagues and wounding three others at the University of Alabama in Huntsville in 2010. Amy Bishop, 47, pleaded guilty to one count of capital murder involving two or more people and three counts of attempted murder during a hearing in Huntsville. She had earlier pleaded not guilty, and her lawyers said she planned to use an insanity defense.

(Updated @ 1:11 pm ET)

As deeply as the mass shootings in Aurora, Colo., shocked the national conscience, they also quickly affected the U.S. political scene, with both major party presidential campaigns ripping up their scripts for Friday, and the mayor of the nation's largest city using the issue to put the candidates on the spot on gun control.