- James Holmes says he won't testify for himself in the penalty phase of murder trial
- He was convicted of killing 12 people in an Aurora, Colorado, movie theater
Holmes told Judge Carlos Samour he voluntarily made his decision and was not pressured by his lawyers.
The monthlong penalty phase of Holmes' trial is set to begin Wednesday.
The same jury that convicted him will deliberate during that phase. In 2013, the prosecution signaled it would seek the death penalty.
Holmes pleaded not guilty by reason of insanity but the jury rejected that defense July 16
when it found Holmes guilty on 24 counts of murder and 140 counts of attempted murder.
Additionally, he was found guilty of one count of possession or control of an explosive or incendiary device. He didn't testify for himself during the first phase of the trial.
Authorities said he killed 12 people and wounded 70 on July 20, 2012, when he opened fire in a crowded movie theater showing "The Dark Knight Rises."
Just after midnight, he started shooting with an AR-15 rifle, a 12-gauge shotgun and at least one .40 caliber handgun, authorities said. The shooting stopped with Holmes' arrest outside the theater about seven minutes after the first 911 calls were made to police.