James Holmes was wide-eyed and unshaven as he sat staring down. At one point he closed his eyes as a judge spoke.

He appeared after being accused of the shooting rampage at a Colorado movie theater that killed 12 people and injured 58 others.

The judge says he will be formally charged next Monday.

Authorities say the 24-year-old former graduate student is refusing to cooperate and it could take months to learn what prompted the horrific attack on moviegoers at a midnight screening of the latest Batman film.

Investigators say they found a Batman mask inside Holmes' booby-trapped apartment after the attack.

Holmes has been held in solitary confinement since Friday.

A Colorado prosecutor says the suspect in the mass shooting at a midnight Batman film screening could face the death penalty.

Eighteenth Judicial District Attorney Carol Chambers said Monday that her office is considering pursuing that punishment against James Holmes. She says a decision will be made in consultation with victims' families.

Holmes is suspected in a shooting at a theater in a Denver suburb that killed 12 people and injured 58.