Video: Aurora's Suspected 'Batman' Shooter Charged With 24 Counts of First Degree Murder

Shooting suspect James Holmes charged with 142 total criminal counts, including murder and attempted murder.

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The suspected 'Batman' shooter James Holmes was formally charged Monday with 24 counts of first degree murder and 46 counts of attempted first degree murder, Denver's KDVR reports.

Holmes is suspected of opening fire on a crowded movie theater shortly after a midnight showing of "The Dark Knight Rises" began on July 20. The shooting left 12 movie-goers dead and 58 injured. Holmes was arrested outside the theater in the early hours of July 21.

[Photos: Colorado Movie Theater Shooting]

At Monday's hearing, Holmes was charged twice for each casualty: once for first degree murder, and once for murder with extreme indifference, according to Reuters. In total he faces 142 criminal charges: 141 murder and attempted murder charges plus one charge of possession of an explosive device.

Holmes and his public defender did not enter a plea at Monday's hearing, which was closed to cameras. Outside the courtroom a large crowd of victims and their families gathered awaiting the charges.

Holmes, a former neuroscience graduate student from the San Diego area, showed little emotion during Monday's hearing. Lawyers from both sides discussed exchanging evidence, including a parcel mailed to one of Holmes' former professors at the University of Colorado's Anschutz campus, where he studied before dropping out in June.

According to Fox News, the package Holmes sent to psychiatrist Dr. Lynne Fenton contained a detailed outline of his shooting plans and may have been a plea for help. Prosecutors say they have yet to open it.

Seth Cline is a reporter with U.S. News and World Report. Contact him at scline@usnews.com or follow him on Twitter.