DENVER — His face was hidden behind a gas mask, and he was costumed from head to toe in a police-style helmet, black cargo pants and black vest. He was such an improbable sight, standing at the front of a theater where a Batman movie was playing, that some in the audience thought he was part of the show.
Then he started shooting.
A year later, the pale and boyish face of James Eagan Holmes is in plain view each time he shuffles into court to face charges of planning and executing his onslaught. But whatever illness or evil might have seized the promising young neuroscientist and contorted him into a mass killer, as prosecutors allege, is still hidden — this time by a mask of a different sort.
Random and disjointed fragments of Holmes' story have emerged, but they don't add up to a coherent story line. They look more like a garbled and fleeting video, a quiet life that explodes in a choreographed nightmare of violence.
Holmes is accused of killing 12 people and injuring 70 in the suburban Denver theater on July 20, 2012. He has pleaded not guilty by reason of insanity, and his lawyers say he carried out the shootings "in the throes of a psychotic episode." But they battle fiercely to keep the details of his mental state a secret, and they say nothing about how it might have set off the rampage.
What is known is deeply contradictory.
As a teen, Holmes was withdrawn and rarely started conversations, according to those who knew him. When he was arrested behind the Aurora theater minutes after the shootings, standing quietly with his hands resting atop his car, he was obedient and eerily limp, police said.
But during the shootings, he allegedly barked out orders and appeared to single individuals out, recalled Stephanie Davies, a witness. "He would shout, 'What are you doing? I said stand up!'" Davies said.
Applying to graduate schools, Holmes strained to leave an impression of stability and maturity. "My life could have gone in a completely different direction had I not possessed the foresight to choose the path of knowledge," he wrote in one application.
But photos exhibited in court show him preening before his smartphone camera like a self-absorbed adolescent on the night before the massacre.
In one, he wore black contact lenses and a black stocking cap, and two tufts of his dyed-orange hair curled out like delicate little horns on either side of his head. In another, he grinned at the camera, a pistol held below his face. A third showed some of his guns and gear laid out on a red sheet on his bed.
As an 18-year-old, Holmes got laughs by telling people one of his ambitions was to own a Slurpee machine.
As a 24-year-old, he went on a weapons spree, buying an assault rifle, a shotgun, two handguns, more than 6,000 rounds of ammunition, high-capacity ammunition magazines, police-style body armor and enough chemicals to rig his apartment into one massive, potentially lethal booby trap, investigators said.
Holmes built crude but complicated detonators meant to lure a neighbor or passer-by into inadvertently setting off the explosives in his apartment at about the time the theater massacre was underway, the investigators said. The idea was to divert police from the theater.
No one took the bait, although one neighbor came perilously close when she went to investigate blaring music that was part of the lure.
"It would have ignited and the whole apartment would have exploded or caught fire," FBI bomb technician Garrett Gumbinner said in January.
Holmes was a sought-after college graduate who won a federal grant for full tuition and $26,000 a year in living expenses for a Ph.D. neuroscience program at the University of Colorado, Denver. But in June of 2012, at the end of his first year, he flunked a major exam, and his professors advised him to find another career, prosecutors said.
Holmes quit the program that month.
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