Joe Lombardo said and exam of Paddock’s brain has revealed ‘no abnormalities’ while girlfriend Marilou Danley had ‘no concerns’ over his mental health.
Detectives have contacted every branch of Paddock’s family tree, including both his ex-wives, but have no uncovered anything that would explain his murderous actions.
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Asked if investigators are any closer to uncovering a motive, he added: ‘We may never know.’
Lombardo was able to shed more light on Paddock’s time in Las Vegas before he began his massacre on Sunday, October 1.
Paddock had arrived in the city three days earlier than originally thought, but stayed in a different room that was provided free of charge by the hotel.