James Holmes, the Batman cinema shooting suspect, has been charged with 24 counts of murder and 116 counts of attempted murder.
A dozen people were killed and 58 were wounded after a gunman burst into a sold-out midnight viewing of the latest Batman film, "The Dark Knight Rises," and began shooting people at random.
He has been charged with 12 counts of First Degree murder and 12 counts of murder with extreme indifference, according to Reuters.
They were formally presented as the 24-year-old made his second court appearance since his arrest.
Holmes was also charged with one count of possession of explosives. Authorities say he booby-trapped his apartment.
Holmes was arrested shortly after the rampage during a midnight showing of the new Batman film.
Legal analysts expect his case to be dominated by arguments over his sanity.
Holmes was a student at the University of Colorado Denver before withdrawing last month.
Carol Chambers, the Arapahoe County District Attorney said last week that deciding whether to pursue the death penalty would involve input from victims and their relatives.
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