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James Holmes Is Charged With 42 Counts of Murder After 'Dark Knight Rises' Shooting

CENTENNIAL, CO - JULY 23:  Accused movie theater shooter James Holmes makes his first court appearance at the Arapahoe County on July 23, 2012 in Centennial, Colorado. According to police, Holmes killed 12 people and injured 58 others during a shooting rampage at an opening night screening of "The Dark Knight Rises" July 20, in Aurora, Colorado.  (Photo by RJ Sangosti-Pool/Getty Images)

CENTENNIAL, CO - JULY 23: Accused movie theater shooter James Holmes makes his first court appearance at the Arapahoe County on July 23, 2012 in Centennial, Colorado. According to police, Holmes killed 12 people and injured 58 others during a shooting rampage at an opening night screening of "The Dark Knight Rises" July 20, in Aurora, Colorado. (Photo by RJ Sangosti-Pool/Getty Images)  (2012 Getty Images)

Colorado prosecutors have formally charged a former doctorate student with 24 counts of murder in the shooting at an Aurora movie theater.

Twenty-four-year-old James Holmes appeared Monday and was also formally charged with 116 counts of attempted murder.

Twelve people were killed and 58 people were wounded or injured. The breakdown of the charges was not immediately clear.

He's also charged with a one count of possession of explosives. Authorities say he booby trapped his apartment.

Holmes was arrested early July 20 outside a Century 16 theater in Aurora during a midnight showing of the new Batman movie.

Legal analysts expect his court the case to be dominated by arguments over his sanity.

Holmes was a student at the University of Colorado Denver before withdrawing last month.

Based on reporting by the Associated Press.

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