A laptop computer recovered from the Las Vegas hotel room where Stephen Paddock launched the deadliest mass shooting in U.S. history was missing its hard drive, depriving investigators of a potential key source of information on why he killed and maimed so many people, ABC News has learned.

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.

Read More: http://abcnews.go.com

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