By Dana Ford and Holly Yan | CNN
(CNN) -- The gunman who opened fire at a New Jersey mall Monday night is dead after holing up in a back room at the mall and shooting himself, a local prosecutor said.
Richard Shoop's body was found at 3:20 a.m. Tuesday in an obscure part of Westfield Garden State Plaza mall, hours after he fired at least six bullets without striking anyone in the massive shopping center.
The shooting sent panic through the mall and set off a frenzied hunt for the gunman. In the early hours of the search, officials weren't sure whether the shooter was still inside or outside the 2-million-square-foot facility.
"We believe that he went in there with the intent to either be shot by police, which we call suicide by cop, or to take his own life, which ultimately he did," Bergen County Prosecutor John Molinelli said Tuesday morning.
The melee started around 9:20 p.m. ET, just as the mall was about to close. Shoop, dressed all in black and wearing a motorcycle helmet, worked his way through the mall armed with a rifle modified to look like an AK-47.
Eddie Kahmann, who works inside the mall, said he heard six or seven gunshots.
"There was just people running like crazy, so I quickly just closed my doors, ran to the back, turned off all the lights, music and everything, just to stay hidden," he said.
Allie Cozic, another mall employee, said everyone was "running to wherever they could."
"It was almost like when you're watching a horror movie and the killer is walking slowly -- that's what it seemed like," she said. "He was wearing all black, it almost looked like body armor of some kind. As soon as I saw the gun, I just turned and ran."
Shoop had plenty of chances to shoot and kill anyone inside the mall. But he didn't.
"There were thousands of people in this mall at 9:20 tonight, and many of them were within 5 feet from him," Molinelli said. "He clearly had the ability to shoot an individual."
Instead, the gunman fired toward the ceiling, an escalator, an elevator and a storefront, the prosecutor said. No one knows exactly why.
Signs of trouble
Shoop, 20, was well known by local law enforcement. He had a history of drug use and abuse, Molinelli said.
"You wouldn't think that at age 20, how much can you do in your life, but in his life, he at least thought that he was reaching a point where there was no recourse but to take his own life," he said.
Authorities spoke with Shoop's family overnight, Molinelli said.
CNN's Susan Candiotti, Chuck Johnston, Eden Pontz, Scott Garber and Laura Dolan contributed to this report.
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