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Rita Paulina, in wheelchair, who was injured in the attack, departs the Arapahoe County Courthouse after an arraignment hearing for accused theater shooter James Holmes, Monday, July 30, 2012 in Centennial, Colo. Colorado prosecutors filed formal charges Monday against Holmes, the former neuroscience student accused of killing 12 people and wounding 58 others at an Aurora movie theater. (AP Photo/Alex Brandon)

In addition to the first-degree murder charges, Holmes was charged with 116 counts of attempted first-degree murder, and 1 count of felony possession of an explosive device. He was also charged with two violent-crime sentencing enhancers, creating an extensive potential prison sentence

Workers with Belfor Property Restoration work to board up a window in the apartment of suspected Aurora movie theater gunman James Holmes, Wednesday, July 25, 2012, as residents were allowed back in the building, which had been closed off by police due to the continuing investigation of the shooting. (AP Photo/Ted S. Warren)

The University of Colorado Denver said Wednesday that the U.S. Postal Service delivered the package Monday, and it was immediately investigated and turned over to authorities within hours.