Cal State Northridge students were mostly stunned Tuesday upon learning the man accused of fatally shooting 58 people and wounding hundreds more in Las Vegas Sunday night was a graduate of their university.

“That’s crazy man,” said Sergio Martinez, 22, of Montebello, a senior who is majoring in business at the university. “I have no words to be honest … I feel shocked.”

Late Monday, CSUN officials learned Stephen Paddock attended the university and completed a degree in business administration in 1977, campus spokeswoman Carmen Ramos Chandler said in a statement.

“Immediately, CSUN’s Chief of Police was contacted, and university officials shared this information with investigators in Las Vegas,” Chandler said.

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Authorities said 58 people were killed and nearly 530 injured in Paddock’s attack on the Route 91 Harvest Festival, where country music star Jason Aldean was performing for more than 22,000 fans.

It was the worst mass shooting in modern U.S. history. The 64-year-old gunman killed himself in his hotel room on the 32nd floor before a SWAT team blew off the door of his room.

He had 23 guns with him at the hotel — along with devices that can enable a rifle to fire continuously, like an automatic — and 19 more guns at one of his homes, authorities said.

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CSUN Chief of Police Anne Glavin said she learned of the news about the gunman at 4 a.m. Monday while checking her email and sent the information on after conducting “due diligence” Tuesday morning.

“It’s a little bit surprising,” Glavin said from her office on Tuesday afternoon. “Like, ‘Wow, of all the universities in the country this is where he was.'”

“This is a piece of the puzzle of who is this guy … and what did his life entail,” she said. “The small piece of the puzzle that we’re contributing is … this is the college he went to and he graduated from CSUN.”

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Glavin declined to talk about what specific records were obtained but said nothing related to a criminal record was found or shared.

“This is about him going to school here,” Glavin said. “We shared his records in terms of the fact he was a student here.”

The information could contribute to the motive, which is the focus of the investigation, Glavin explained.

“He didn’t do anything egregious here,” the chief noted. “The puzzle is trying to figure out what happened along the line.”

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Paddock was no stranger to the San Fernando Valley. A portion of his youth was spent as a student within the Los Angeles Unified School District.

He attended John H. Francis Polytechnic High School in Sun Valley, graduating in 1971, according to district spokeswoman Barbara Jones.

Paddock also attended Richard E. Byrd Middle School, also in Sun Valley, in 1965, Jones said.

In the 1970s and ’80s, he worked as a mail carrier and an IRS agent and held down an auditing job in the Defense Department, according to the government. He later worked for a defense contractor.

He had no known criminal record, and public records showed no signs of financial troubles, though he was said to be a big gambler.

Spoke w/3 #CSUN business students & all were "shocked" that Stephen Paddock graduated with a degree in business administration here in 1977 pic.twitter.com/zxwzTQDSug — Wes Woods II (@JournoWes) October 3, 2017

On CSUN’s campus Tuesday, Keith Ralph, 49, was sitting at a table studying near the David Nazarian College of Business and Economics.

The senior, like Glavin, said the alleged shooter could have graduated from anywhere.

“It just so happened he was from Cal State Northridge,” said Ralph, a senior business management major. “At this point it is still unknown where his mind was.”

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Viri Iguaran, 21, of Palmdale, who is majoring in business finance noted it was “horrific” about Paddock attending the school.

“A graduate from CSUN did that,” Iguaran, a senior, said in disbelief. “At CSUN, we’re taught good morals … it’s just so sad.”

The university on Monday shared in a written statement that their “hearts and thoughts are with the victims, survivors, first responders and loved ones impacted by this horrific mass shooting.”

“While no words can truly express the loss and sadness the nation feels today, the CSUN community offers its profound sympathies to those affected by the heinous violence that occurred in Las Vegas,” Chandler said.

The Associated Press contributed to this article.