As questions spiral about a significant shift in the timeline of the Las Vegas shooting, a security guard stands in the middle of the controversy: Jesus Campos.

At first, Campos, a guard at the Mandalay Bay Resort and Casino, was hailed a hero for helping guide police to gunman Stephen Paddock's room on the 32nd floor. Police said Campos was shot in the leg at the end of Paddock's assault on concertgoers—potentially distracting the gunman and causing him to panic and kill himself.

But now, questions have been raised after Clark County Sheriff Joe Lombardo revised the timeline and said Campos had actually been shot about 9:59 p.m.—a full six minutes before the mass shooting began at 10:05 p.m.—which means the guard could have instead led Paddock to start opening fire on the crowd for fear of being caught.

Trending: Big Data, Big Problem: Could Wall Street See Insider Trading Lawsuits Over Selling Data Sets?

Police have said it was difficult to identify the source of the bullets during the attack, and the confusion added more minutes to their lengthy response. But the revised timeline shows officers would have known where Paddock was before the mass shooting even started.

Did Campos call 911? What happened during those six minutes?

Much of Campos's story and background remains a mystery.

Campos's co-worker Liliana Rodriguez started a GoFundMe account for him on October 3, explaining that he'd been shot while on "random patrol" and it could have been "anyone of us."

Don't miss: Plutonium Shortage Threatens NASA’s Missions to Deep Space, U.S. Government Warns

"Funds will be used to provide relief and financial support for him while he gets back on his feet," Rodriguez's online petition says. "This is a young man that I work with day in and day out. Any financial support would be appreciated for the time he would need to recover."

A picture of Campos wasn't displayed as part of the fund because Rodriguez indicated that "due to privacy from the media we do not feel comfortable publishing a photo."

Story continues

During a brief phone conversation with ABC News, Campos said, "I'm fine...I was just doing my job."

Calls and text messages to Campos, Rodriguez and others who might know him were not immediately returned.

Most popular: USMNT Crashes Out of World Cup 2018: ‘What Are We Doing? WHAT Are We Doing?’ (Taylor Twellman Has an Answer, Sort of)

On Tuesday, Las Vegas Metro Police Undersheriff Kevin McMahill explained more about Campos's actions the night of the shooting, helping fill in some of what happened ahead of the attack.

He told KNPR, a local NPR affiliate, that Campos went up to the 32nd floor to investigate a door alarm. While on the 32nd floor, he found that a stairwell door was jammed and radioed down to maintenance.

Campos heard a drilling sound and thought it was odd. A maintenance worker came up to the 32nd floor. As the pair started talking, Paddock began firing through the door of his room, first with a single-fire gun and then with a rapid-fire rifle.

Police have said that when Campos radioed what happened, it helped them track where Paddock was holed up. McMahill didn’t elaborate on the six minutes or why police found it difficult to locate Paddock when, according to the new timeline, they had his location minutes before the assault started.

“I understand why people are frustrated with this because we are as well,” McMahill told KNPR.

More from Newsweek