James Holmes

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** FILE ** Prosecutors say James Holmes, seen here in court July 23, 2012, was banned from the University of Colorado. (Associated Press)

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Defense attorneys for James Holmes, shown in a court appearance three days after the July 20 massacre in an Aurora, Colo., movie theater, said in a return to court Thursday that their client is mentally ill and that they need more time to assess the nature of his illness. (Associated Press)

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** FILE ** James Holmes, accused of killing 12 people in a July 20 shooting rampage at an Aurora, Colo., movie theater, appears on Monday, July 23, 2012, in Arapahoe County District Court in Centennial, Colo., with defense attorney Tamara Brady. (Associated Press/Denver Post)

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Mourners comfort each other as they depart a memorial service Wednesday for Gordon Cowden, one of 12 people killed in a shooting attack early Friday at the packed theater during a showing of the latest Batman movie, “The Dark Knight Rises.” Police have identified the suspected gunman as James Holmes. (Associated Press)

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James Holmes

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In this image taken from video provided by KUSA.com, James Holmes, left, the suspected gunman in Friday's Colorado theater massacre, makes his first appearance in court with his attorney Tamara Brady in Centennial, Colo., on Monday, July 23, 2012. (AP Photo/KUSA.com)

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Firefighters and police gather after an explosion could be heard outside the apartment of James Holmes in Aurora, Colo., Saturday, July 21, 2012. Federal authorities detonated one small explosive and disarmed another inside Holmes' apartment, but several other explosive devices remained, said Aurora police Sgt. Cassidee Carlson. Twelve people were killed and dozens were injured in a shooting attack early Friday at a packed movie theater during a showing of the Batman movie, "The Dark Knight Rises." Police have identified Holmes, 24, as the suspected shooter. (AP Photo/Ed Andrieski)

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** FILE ** Members of law enforcement wearing body armor and helmets prepare to what ATF sources describe as a "water shot" in the apartment of alleged gunman James Holmes Saturday, July 21, 2012 in Aurora, Colo. (AP Photo/Alex Brandon)