Bruce Paddock is not considered a suspect in the Las Vegas shooting.
In a statement, the Los Angeles Police said their investigation began when evidence was found inside a business where Bruce Paddock had been squatting after he was evicted.
Several days after the attack, authorities found several guns, a "plethora of ammunition", and many electronic devices at Paddock's home in Reno, Nevada, USA Today reports.
Bruce Paddock had a lengthy criminal history well before his brother opened fire on concertgoers along the Las Vegas Strip on October 1. He said he was shocked to hear the news, but said Paddock was a "psych" patient, who had often complained about the amount of medications he was given, but according to Simpson, Paddock needed the medicine. DEVELOPING.We will add more details to this report as they become available. Investigators also discovered that Paddock had purchased software created to erase files from a hard drive, but it is not yet known if the software was used.
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Authorities have reached out and spoken to Paddock's family and girlfriend.
Bruce Paddock has not been booked yet, but the official tells PEOPLE charges are expected to be filed sometime today.
Unlike some other mass killers, Mr Paddock did not leave behind a note, manifesto or video explaining his actions. "It wasn't suicide by cop since he killed himself", he said at the time.
In 2012, Sandy Hook Elementary School shooter Adam Lanza destroyed his hard drive before he gunned down 20 children and six adults at the Newtown, Connecticut, school.