In another tribute to the 58 killed and almost 500 injured, the casino marquees on the Las Vegas Strip will go dark at 10:05 p.m. Sunday to mark exactly a week passing since the shooting.
Investigators have also reviewed "voluminous amounts of video from numerous locations", but McMahill said that they have not "located any other person that we believe to be a suspect at this point".
The bloodshed might have lasted longer, with greater loss of life, but for a hotel security officer who was sent to check an open-door alarm on the 32nd floor, and discovered the gunman's whereabouts after the shooting started, McMahill said.
Sergeant Joshua Bitsko and Officer Dave Newton of the K9-unit had been training dogs when they heard the message over police radio about an active shooter.
Authorities said last week that security guard Jesus Campos had approached Paddock's room as the shooting was underway, diverting the gunman's attention.
"My staff takes their job very seriously and if there were any red flags during this transaction, like any other, it would be halted immediately", said David Famiglietti of New Frontier Armory in Las Vegas, where Paddock purchased a shotgun and a rifle this spring.
Charles "Sid" Heal, a retired Los Angeles County sheriff's commander and tactical expert, said the new timeline "changes the whole perspective of the shooting".
"What we know is Stephen Paddock is a man who spent decades acquiring weapons and ammo, and living a secret life, much of which will never be fully understood", the sheriff said.
He declined to reveal what they had said, but stated: "Every piece of information we get is one more piece of the puzzle". In past mass killings or terrorist attacks, killers left notes, social media postings and information on a computer, or even phoned police.
Eric Paddock, brother of Las Vegas gunman Stephen Paddock, speaks to reporters near his home, Monday, Oct. 2, 2017, in Orlando, Fla.
Lombardo had previously said that while he did not know what caused Stephen Paddock, the 64-year-old gunman, to stop shooting, he assumed it was due to the security guard's arrival, hailing the guard as a hero.
This could be evidence that Paddock was hoping to escape after a shoot-out with police, which Sherriff Joseph Lombardo alluded to as a possibility on Wednesday. "You know, we were still clearing that room, the curtains, moving the curtains", Mr Donaldson said. The sheriff gleaned insight from the trip, he said, and the department now reacts more quickly to such shootings, forming a team to "cease the action" of the assailant.
His 64-year-old brother killed 58 people and injured 489 others at the Route 91 Harvest country music festival on October 1 by firing high-powered rifles from his high-rise hotel room at Mandalay Bay across the street.
Newton added that forcing entry into the room with an explosive before finding Paddock's body and an arsenal of weapons was like something "out of a movie". "I have good access to him", he said according to Oklahoma's News 4. He was quick to say that MGM Grand Resorts, which owns the Mandalay Bay, is also vigilant about safety. Paddock killed himself before police entered his room.
Federal Bureau of Investigation agents also met with Paddock's brother Eric Paddock for another round of questions after he arrived in Las Vegas to pick up the killer's remains, according to the Las Vegas Review-Journal.
Bitsko said the level of preparation and work inside, including setting up wires for the cameras, suggested that it took Paddock "days to finish" getting it all ready.
Sometimes, he paid the woman roughly $7,500 an encounter to play out rape fantasies, where he tied her up and instructed her to "scream" for help, she said.