Benjamin Hoskins Paddock, a convicted bank robber and con man described in a wanted poster as "psychopathic" with suicidal tendencies, had escaped from prison in 1969, earning him a spot on the FBI's list of most-sought-after and unsafe criminals.
Officials think Paddock brought the weapons into the hotel by himself but did not provide specifics.
The bandit is understood to have wound up on the FBI's Most Wanted list in 1969 when he escaped from prison in Texas while serving a 20-year sentence. "Sometimes he would get picked with me and sometimes I would get picked with him", Alarcon said Tuesday. Eric Paddock still can't wrap his head around why his brother - who publicly held no political or religious affiliation - would commit mass murder.
For Eric, Stephen was just a normal guy. According to NBC, Benjamin was first arrested in Las Vegas the late 1960s after stealing $25,000 from three Arizona banks.
The scene of the deadliest mass shooting in modern USA history was chilling.
They also don't know the recipient.More news: Nawaz Sharif set to be re-elected as PML-N chief
The Islamic State of Iraq and Syria (ISIS) claimed responsibility for the attack, saying the shooter had converted to Islam, but provided no evidence. It has so far believed that he acted alone and that he has no connection to terrorist groups.
Marilou Danley was identified as Paddock's companion or roommate, Lombardo said.
Paddock reportedly was using Danley's identification to play video poker in the days leading up to his rampage.
Authorities initially believed Marilou Danley was traveling with Paddock at the time of the attack, but have since confirmed she's been traveling overseas since September 25 and was in the Philippines at the time of the attack, NBC reported.
The FAA will not release any information regarding his mental health from his last certification in 2008 because it is protected under federal privacy rules. Since Paddock didn't have a criminal record, Nevada's gun laws would allow him to amass such a collection, which included automatic rifles that may have been converted from semiautomatic weapons.