It has been a week since Stephen Paddock, a 64-year-old retired accountant and high-stakes video poker player, opened fire on 22,000 country music fans from his 32nd-floor suite in Las Vegas’ Mandalay Bay Resort on the city’s Sunset Strip, killing 58 people and wounding hundreds of others before fatally shooting himself in the head.
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Here are some of the latest details:
Security guard shot before concert shooting began
On Monday, Clark County Sheriff Joseph Lombardo announced a change to the sequence of events that occurred on Oct. 1, saying a security guard who encountered Paddock was shot at 9:59 p.m. local time, minutes before Paddock unleashed a hail of gunfire on unsuspecting concertgoers.
Previously, authorities said that the security guard, Jesus Campos, was shot after Paddock had opened fire on the crowd below.
Lombardo said Campos immediately reported to hotel security that he had been shot. However, responding officers did not know Campos had been shot until they arrived on the 32nd floor and encountered him, Lombardo said.
It's unclear what led Paddock to stop shooting at the people below. Officials originally thought that Campos distracted him.
At least 200 mourners went to the elementary school attended by Nicol Kimura in Placentia, California, where they lit candles and held photos this weekend depicting happier times for a woman whose smiles and cowboy boots radiated.
She was one of the people slain by Paddock.
Kimura, 38, according to The Associated Press, worked at a California tax agency and made the trip to the three-day Route 91 Harvest country music festival with a group of friends who call themselves "framily."
Dozens of others went out along the Huntington Pier in California to remember the lives lost.
Some of the bereaved were at that Route 91 Harvest concert when gunshots rang out.
Strip marquee tribute
The Strip's signature blinking lights went dark Sunday night in memory of the tragedy, exactly one week after the shooting.
Second search conducted
After questioning Paddock's girlfriend, Marilou Danley, federal agents returned to Paddock's three-bedroom home on a cul-de-sac in a sleepy retirement community in Mesquite, Nevada.
They breached the boarded-up garage days after Las Vegas police first searched the home shortly after the rampage and confirmed they pulled 19 guns and several pounds of explosive materials.
The return to the residence, which Paddock purchased in early 2015, was reportedly for "redocumenting and rechecking," said Mesquite Police Chief Troy Tanner, who tagged along with the FBI agents to serve the search warrant.
A handwritten note with numbers for wind, trajectory and distance was discovered in Paddock's Mandalay Bay suite.
Law enforcement officials briefed on the investigation confirmed for ABC News on Sunday that the note, found on a nightstand, contained such figures.
The details of the note were first reported by CBS' "60 Minutes."
Killer's brother in Las Vegas
Stephen Paddock's brother Eric Paddock arrived in Las Vegas on Sunday to aid authorities in their investigation.
"I'm here to help them move forward with their investigation," Eric Paddock, 57, told The Las Vegas Review-Journal on Sunday outside his hotel. "I want to help them understand what they're seeing."
Eric Paddock spoke to ABC News after the bloodshed, saying he was "dumbstruck" by the news and compared discovering that his brother committed the killings to being "crushed by an asteroid."
"We have no idea how or why this happened," he said. "As far as we know, Steve was perfectly fine."
He added that his brother wasn't one to harbor any strong political, extremist or religious beliefs.
So far, no extremist group ties
While ISIS came forward to claimi responsibility for the attack, the FBI has not uncovered connections between Stephen Paddock and any foreign terrorist groups.
"The FBI stated there is no apparent tie to international terrorism," one senior official told ABC News. "Perhaps ISIS is just trying to take credit."
Employee comes forward
Lisa Crawford spoke to "Good Morning America" on Monday about working as a property manager for Paddock in Texas from 2006 to 2012.
She recalled him as generous to his tenants.
"He actually cared about everybody," Crawford said. "He tried to make people happy. He tried to make people care. And I don't know what happened to him."
Danley was questioned by authorities and privately told her family she has a "clean conscience."
When her boyfriend fired bullets at thousands of unarmed concertgoers, she was in the Philippines "to see family and friends," she said in a statement.
Paddock had apparently purchased her airfare to the Philippines and then wired her money to purchase a house for herself and her family.
The said in her statement that the move made her "grateful but worried" that he was breaking up with her.
Through her attorney Matthew Lombard, Danley said she never foresaw "something horrible like this was going to happen" and described Paddock as a "kind, caring man."
She added in the statement, "I loved him and hoped for a quiet future together with him."