Federal agents said suspect James Holmes began buying guns two months before the attack.
Steven Singer, 48, was pronounced dead at a hospital, said Phoenix police public information Officer James Holmes.
Hearings in the James Holmes trial are underway and a trial date has been set for February 2014.
James Holmes had his access to the University of Colorado campus revoked after the threat, they say.
The attorneys said in a court motion that James Holmes, 25, was "currently willing to resolve the case".
BBC: James Holmes 'ponders guilty plea' to avoid death penalty
The shootings of Thomas Holmes, James Holmes and Tony Draper were described in Peterborough Crown Court as a "Rambo-style attack".
James Holmes and Toshi Yoshihara of the United States Naval War College have followed the uses and abuses of Mahan.
Newly released court documents show Dr Lynne Fenton told police of threatening text messages James Holmes sent after he stopped attending counselling.
James Holmes, who identified himself to police as "the Joker, " made his first court appearance on Monday and will be formally charged July 30.
Winter reported that suspect James Holmes sent a psychiatrist a notebook containing drawings that foreshadowed the July 20 attack, which killed 12 and injured 70.
Meanwhile, in Colorado, a judge ordered James Holmes to stand trial for his role in the movie theater shooting that left 12 people dead and scores injured.
CNN: Gun violence task force meets with makers of video games
' Everybody knows that James Holmes committed these horrible murders.
CNN: Colorado theater shooting suspect offers to plead guilty
You will all remember a crucial breakthrough in the James Holmes case that came courtesy of Jana Winter, a veteran Fox News journalist, in late July of last year.
The particular motivations of alleged killer James Holmes aren't relevant -- the next gunman will have different motivations -- but the general state of mental health care in the United States is.
In the article, New York-based reporter Jana Winter cited anonymous law-enforcement sources who said shooting suspect James Holmes sent a notebook containing violent drawings to a University of Colorado, Denver psychiatrist before the attack.
James Holmes was a patient of a University of Colorado psychiatrist before the attack in Aurora, Colorado, which killed 12 people and wounded scores more, according to a court document filed Friday by his lawyers.
The professor who wrote the e-mail wonders if the suspect is the James Holmes she knows and asks others if they think it would be wise to meet with the students who may have had class with him.
Centennial, Colorado (CNN) -- A judge on Tuesday entered a standard plea of not guilty for James Holmes, the man suspected in a mass shooting at a Colorado movie theater, after he and his attorneys said they were not ready to enter a plea.
CNN: Judge enters not guilty plea for accused theater shooter
Dr. Lynne Fenton, the psychiatrist who works at the University of Colorado and saw Holmes as a patient, "knew that James Holmes was dangerous" and "had a duty to use reasonable care to protect the public at large from James Holmes, " according to the lawsuit.
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