The heavy gambler had $2.1 million in his bank account in 2015. By last September, that had dwindled to $530,000. It was one month before Stephen Paddock carried out the deadliest mass shooting in modern American history.

But Clark County Sheriff Joe Lombardo said the steep financial losses alone can’t fully explain why Paddock checked into the Mandalay Bay Hotel and Casino with guns in his suitcases and murder on his mind in the days leading up to Oct. 1.