Metro Police Sheriff Joe Lombardo on Friday adjusted the timeline of the deadly mass shooting, saying the Las Vegas gunman shot a hotel security guard “in close proximity” to opening fire on 22,000 people attending an outdoor concert.

The revision comes amid mounting questions about the sequence of events, which authorities have changed several times. Police previously said the Mandalay Bay Resort and Casino security guard was shot six minutes before bullets rained down on concert goers.

Lombardo, who has repeatedly said details will change as the investigation progresses and did not take questions Friday during a news conference, offered this new timeline:

• Jesus Campos, a Mandalay Bay security guard, encountered a barricaded stairwell door adjacent to the suspect’s room at 9:59 p.m.
• Campos notified hotel security and sought access to the 32nd floor, where he originally had been dispatched to check on an ajar hotel room door, from a different direction.
• Campos gained entry to the 32nd floor and proceeded to check on the ajar door. The gunman, who was in a separate hotel room, shot Campos immediately prior to 10:05 p.m., when the first volley of gunfire struck concert goers. Campos alerted others via radio and cell phone that he had been shot.
• Police officers arrived on the 32nd floor at 10:17 p.m. By then, the gunfire had ceased.

The unrelenting stream of gunfire into the crowd killed 58 people and injured 546 others. But the sheriff acknowledged the death toll may rise: Forty-five victims remain hospitalized, including some with critical injuries.

Lombardo said investigators have established that timeline based off information gathered from interviews, security and dispatch logs, police body cameras and hotel surveillance.

“Imagine bringing that all together to ensure we are drawing an accurate picture,” he said.

Lombardo said his intent in releasing initial, albeit unverified, details surrounding the timeline was to give the public as much information as possible. He has described it as a balancing act — trying to calm a community hungry for answers while also conducting a complex investigation.

The revised timeline comes a day after MGM Resorts International, which owns Mandalay Bay, released a statement denying significant lag time between when the suspect, 64-year-old Stephen Paddock, shot the security guard and fired onto the Route 91 Harvest music festival.

“The 9:59 p.m. PDT time was derived from a Mandalay Bay report manually created after the fact without the benefit of information we now have,” the gaming company said in a statement. “We are now confident that the time stated in this report is not accurate. We know that shots were being fired at the festival lot at the same time as, or within 40 seconds after, the time Jesus Capos first reported that shots were fired over the radio. Metro officers were together with armed Mandalay Bay security officers in the building when Campos first reported that shots were fired over the radio.”

The statement goes on to say MGM Resorts — already named in a lawsuit filed earlier this week by a woman shot at the concert — will continue working with investigators to develop the timeline.

Lombardo rejected any notion of discord or suppression of evidence among the entities involved in the investigation.

“There’s no conspiracy between the FBI, the LVMPD and the MGM,” he said. “Nobody is attempting to hide anything referencing this investigation.”

Authorities have still not determined the shooter’s motive. The FBI has conducted hundred of interviews, tracked down nearly 2,000 leads and is extensively reviewing digital evidence to answer that haunting question, Special Agent in Charge Aaron Rouse said.

Lombardo took a moment to commend his officers, including several who drove onto Las Vegas Boulevard, prompting the shooter to direct his gunfire toward them. One officer who was shot as a result had a question for the sheriff Friday:

“He asked me if he could go back to work today,” Lombardo said, while stifling tears.

Disclosure: MGM Resorts International is a major donor ($250,000) to The Nevada Independent. We disclose all our donors here.