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.
Holmes was charged with 24 counts of murder, two each for the 12 victims, and 116 counts of attempted murder, two each for the 58 injured.
For the murder charges, one count included murder with deliberation, the other murder with extreme indifference. Both counts carry a maximum death penalty upon conviction; the minimum is life without parole.
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.
Colorado prosecutors are expected to file formal charges against James Holmes, the former neuroscience student accused of killing 12 people and wounding 58 others at an Aurora movie theater.
Attorneys will also argue at this morning's hearing over a defense motion to find out who leaked information to the news media.
The information included details about a package the 24-year-old former neuroscience graduate student allegedly sent to his psychiatrist at the University of Colorado Denver.
Legal analysts expect the case will be dominated by arguments over the defendant's sanity.
Holmes allegedly began stockpiling gear for his assault four months ago, well before the shooting spree just after midnight during a showing of the Batman film "The Dark Knight Rises." He was arrested by police outside the theater.