A gambler who appeared to be a stranger to his neighbours, Mr Paddock amassed dozens of guns and a stockpile of ammunition before gunning down 58 people at a country music concert and injuring hundreds. His father, Benjamin Hoskins Paddock was a notorious bank robber who was on the FBI's Most Wanted list for almost a decade.
If Paddock did remove the laptop's hard drive in an attempt to hide digital evidence, he wouldn't be the first mass shooter to do so.
Paddock is believed to have removed the hard drive before fatally shooting himself, and the missing device has not yet been recovered, sources told ABC News.
It was not immediately clear Wednesday if he has retained an attorney.
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In a press release, the Los Angeles Police Department said the investigation began after evidence was discovered inside a business where Bruce Paddock had been squatting after being evicted.
Bruce Paddock spoke to NBC News following the October 1 shooting at an outdoor music festival in Las Vegas that left 59 dead.
In prior mass shootings, authorities have uncovered writings and manifestos that would clue them into the motive, but no such writings have been discovered connected to Paddock.
Sandy Hook shooter Adam Lanza smashed the hard drive of his computer with a hammer and a screwdriver before going on a rampage at an elementary school in 2012.