A courtroom artist's sketch of James Holmes.

(Bill Robles/For CPR News)

A psychologist from the state mental hospital testified Wednesday that James Holmes was prone to psychotic episodes. That could help his defense team claim that Holmes was insane during the attack. Holmes has pleaded not guilty by reason of insanity for killing 12 people at an Aurora movie theater three years ago.

Dr. Rose Manguso examined Holmes a year after the shooting. Under defense questioning, she told the jury he reported hearing voices in jail. 

"He thought that the television was broadcasting special messages meant only for him, although he doesn’t recall the content and that his thoughts were being broadcast outside his head so that others could read his mind," said Manguso.

Manguso also testified she did not believe Holmes was faking his mental illness. 

On cross examination, prosecutors noted that Manguso's colleagues at the hospital found Holmes legally sane at the time of the attack.

Holmes could get the death penalty if found guilty.