Batman Mask Links John Holmes to 'Dark Knight' Theater Shooting

A Batman mask, a violent drawing, and a calendar "with a unique symbol" on the day of the "The Dark Knight Rises" shooting was recovered from the apartment of Aurora Colorado movie theater shooter James Holmes.

The prosecution is now attempting to have the evidence entered into trial as part its case against Holmes, claiming that he was sane when he killed 12 movie goers and wounded more than 70 other individuals during "The Dark Knight Rises" premiere last July as they seek a death penalty for the killer.

Having acknowledged that their client was guilty of the mass murder, Holmes' attorneys argue that the 25-year-old was not sane at the time he carried out the killings. The guilty by reason of insanity to murder and other related charges in the case would allow Holmes to avoid the death penalty.

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The evidence being introduced by the prosecution in recent weeks, including the Batman mask, will likely be used to undermine Holmes' insanity plea, CBS News reported.

The Batman mask and marked calendar was recovered by the FBI on July 20, 2012, according to agent Leslie Kopper, CBS News reported. Kopper refused to identify the way in which Holmes' calendar had been marked, describing it only as "a unique symbol."

The violent drawing recovered from Holmes' backpack was found in a spiral notebook by Aurora Police Detective Thomas Wilson, who earlier this week testified that it appeared to have been "some kind of maze game involving a serial killer."

Prior to the attack Holmes had also sent a psychiatrist a notebook that contained violent drawings, Fox News reported. In addition to the Batman mask and other items mentioned above, other evidence introduced to the trial by the prosecution included Holmes' bank and computer records, as well as his pretrial statements and documents that showed he had purchased various explosives and weapons.

Holmes' defense argued that much of the evidence being introduced by the prosecution was seized illegally by police who reportedly entered the apartment before first receiving a warrant.

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Prosecutors fired back that the search and seizure was in fact legal due to the fact that police were acting on information that Holmes had informed that there were explosives in his apartment, and authorities did not have the time to wait for a warrant considering the potential danger they posed, CBS News noted.

The judge has yet to say whether or not he will allow the above mentioned evidence to be entered into the trial.