The girlfriend of Stephen Paddock, the man who massacred nearly 60 people attending a music festival in Las Vegas, has returned to the United States from the Philippines, according to media reports.

Marilou Danley, 62, was met at Los Angeles International Airport by FBI agents on Tuesday night after flying from Manila, multiple media outlets reported. Investigators named Danley as a “person of interest” in the investigation. Prior to her arrival, Las Vegas Sheriff Joseph Lombardo said “we anticipate some information from her shortly.”

This undated photo provided by the Las Vegas Metropolitan Police Department shows Marilou Danley, 62. Danley was met at the airport by FBI agents on Tuesday night. 

Authorities in the U.S., the Philippines and Australia were involved in the search for Danley, who travels on an Australian passport, CNN reported. She was in the Philippines at the time of the shooting, according to media reports.

Immigration documents in the Philippines say that Danley first arrived there on Sept. 15, departed on Sept. 22 then returned three days later on a flight from Hong Kong.

She landed in Los Angeles at about 7.30 p.m. local time Tuesday, CNN reported.

The Australian Associated Press reported that Danley was born in the Philippines and moved to Queensland in eastern Australia in the early 1980s. She left Australia for the U.S. in 1989, where she worked in casinos, it said.

Paddock, 64, killed at least 58 people and injured 527 others Sunday night in the deadliest mass shooting in modern U.S. history. The Associated Press put the death toll at 59 Wednesday. Paddock killed himself in the 32nd floor hotel room he used as a vantage point to rain bullets down on people attending the Route 91 Harvest festival.

Lombardo said he is “absolutely” confident authorities will find out what set Paddock off.

Paddock transferred $100,000 to the Philippines in the days before the shooting, the AP reported. It said investigators were trying to trace the money and were probing at least a dozen financial reports over the past several weeks that said Paddock gambled more than $10,000 per day.

Investigators say that the shooting rampage was meticulously planned and included specially modified weapons. Investigators found a computer and 23 guns in Paddock's hotel room. Nineteen more guns were found at his home in Mesquite, about 80 miles northeast of Las Vegas, and seven at his house in Reno.

Paddock also used surveillance cameras to monitor police approaches to his room at the Mandalay Bay Resort and Casino — including a camera he positioned in the peephole of the door.

“I anticipate he was looking for anybody coming to take him into custody,” Lombardo said.

At a late-night press conference Tuesday, authorities said Paddock, a high-stakes gambler and retired accountant, made his attack even more deadly by adding more lethal components to his weapons. He had devices attached to 12 semiautomatic rifles that allowed them to mimic fully automatic gunfire.

Bureau of Alcohol, Tobacco and Firearms Special Agent in Charge Jill Schneider said Paddock had a combination of rifles, shotguns and pistols in the three locations.

The gun attachment that mimics automatic gunfire is a little-known device called a “bump stock” that is not widely sold. The stocks have been around for less than a decade, and Schneider said officials determined they were legal.