As authorities struggle to find a motive for the attack, it has been revealed that his father Benjamin Hoskins Paddock, who went by alias "Big Daddy", "Chromedome" and "Old Baldy", was on the FBI's Most Wanted list from June 10, 1969 through May 5, 1977.
Police said Paddock, 64, was found dead when authorities stormed his Mandalay Bay hotel room.
They also recovered 19 firearms plus explosives and several thousand rounds of ammunition from Paddock's home in Mesquite, Nevada, a town near the border with Arizona, Joe Lombardo, the Las Vegas metropolitan police department Sheriff, told reporters.
Authorities previously disclosed Paddock had 1,600 rounds of ammunition in his vehicle, along with fertilizer that can be used to make explosives and 50 pounds of Tannerite, a substance used in explosive rifle targets.
And he said he felt it was unlikely Paddock could have pulled off the elaborate plan alone, though investigators have no idea who may have helped him. Other than that, there were no red flags in Paddock's history.
Local news reports soon after his crimes were reported to have said that neighbours "couldn't believe that the colorful businessman, then 34 years old, was involved in crime".
Stephen Paddock had no criminal history in Nevada, police say. More than 500 were also injured in the attack.
Paddock's family is dumbfounded by the news.
He said the death toll had risen to 59, with another 527 people wounded.
"He was a sick man, a demented man", US President Donald Trump said.
"[Paddock] meticulously planned one of the worse domestic attacks in USA history", Lombardo said. "I loved him and hoped for a quite future together with him", Danley said in the statement read to media by her attorney. A dozen of them included "bump stocks", attachments that can effectively convert semi-automatic rifles into fully automated weapons.
Paddock had barricaded the stairwell doors and pointed his makeshift cameras system toward the elevator as Campos approached, said Hickey, head of the International Union, Security, Police and Fire Professionals of America.
The gunman's brother, Eric Paddock, said he was "completely befuddled" by his brother's actions.