CENTENNIAL, Colo. (KDVR) - As the trial continues in the case against the alleged Aurora movie theater shooter, a notebook gave the public its first look into the mind of the defendant, James Holmes.
The prosecution says Holmes extensively planned the attack on the Century 16 movie theater on July 20, 2012.
The attack left 12 people dead and injured 70 others.
Holmes has pleaded not guilty by reason of insanity.
The notebook was believed to be an important piece of evidence for both the prosecution and the defense.
The prosecution says Holmes not only had been planning the mass murder, but also his insanity plea.
"The obsession to kill since I was a kid, with age, became more and more realistic," the notebook read, according to Sgt. Matthew Fyles, who took the stand to read the passages.
The notebook included detailed plans and different options of attack, which the shooter listed pros and cons for each idea.
An airport was ruled out because of its extensive security presence and its connection to terrorism.
"Terrorism is not the message," a passage read. "The message is, there is no message."
Fyles went on to explain the notebook also showed different options of which theater to hit, explaining in detail the size and exit strategy of numerous theaters.
The shooter also was aware that the Aurora Police Department was close to the theater and documented their estimated response time at three minutes.
The defense also cited nonsensical passages in the notebook, saying Holmes suffered from mental illness.
"So that's my mind. It's broken. I tried to fix it. Using something that's broken to fix itself was insurmountable," a passage read.
Sgt. Fyles also read symptoms listed in the book like excessive fatigue, catatonia and 'hyper speed' movements.
If Holmes is found not guilty by reason of insanity, he will be confined to a state psychiatric hospital indefinitely.
If he is found guilty, prosecutors are pushing for the death penalty.