CENTENNIAL, Colo. (CBS4) – A notebook filled with the thoughts of the man who opened fire in a crowded movie theater was presented as evidence in the trial on Tuesday.

The notebook revealed that James Holmes had “an obsession to kill since I was a kid, with age became more and more realistic,” as read by Aurora Police Sgt. Matthew Fyles.

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Fyles read Holmes’ words during testimony in court from a notebook where Holmes seemingly planned the attack.

The notebook was received at the University of Colorado Anschutz Medical Center where Holmes had been studying in the neuroscience program until he withdrew. It was sent to Dr. Lynne Fenton, a psychiatrist he had been seeing. The notebook surfaced after the shooting.

The notebook also reveals that Holmes considered a mass attack in various ways, even planning to attack an airport, and using biological agents.

“The entire world with nuclear bombs then shifted to biological agent that destroys the mind,” Fyles read from the notebook.

Holmes eventually settled on a movie theater. Those plans included diagrams of the Century 16 Cinemas in Aurora and the accumulation of weapons.

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“It says, ‘Buy stun gun and folding knife, research firearms, laws and mental illness,'” read Fyles.

Holmes has pleaded not guilty by reason of insanity for the July 20, 2012 shooting which left 12 people dead and dozens others injured.

“‘And finally, the last escape, mass murder at the movies … correct?” the prosecutor said.

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Correct,” responded Fyles.

Another passage reads, “Embrace the hatred … The Dark Knight Rises.”

Jurors were only given a limited amount of time with copies of the notebook. They will have access to the writings during deliberation.

The defense concentrated on passages that seemed to make little sense, including one called “Self Diagnosis of a Broken Mind.”

“Dedicated to dedicate life to killing others so I could live,” read Holmes’ attorney Dan King.

The notebook mentions symptoms the defendant listed including excessive fatigue, isolationism followed by periods of invincibility.

Another shooting survivor testified on Tuesday. Jacqueline Fry was at the movie with a group from a Red Robin restaurant. While on the stand, she struggled to tell the story of how she was shot multiple times and her friend, Alex Sullivan, was killed.

“I do remember lying on the ground and spitting out teeth and blood; and my four front teeth were shattered,” said Fry.

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Fry survived but her friend Sullivan died.