Stephen Paddock fired at a concert crowd in Los Vegas killing 58 people.
Stephen Paddock's brother, Bruce Paddock, was arrested early Wednesday in Los Angeles, officer Norma Eisenman told AFP.
She said Paddock was facing child pornography charges in relation to a probe that began before the shooting in Las Vegas that left 58 people dead and hundreds wounded.
Bruce Paddock reportedly had a lengthy criminal history and over the years has been charged with various crimes including arson and burglary.
The brothers' father was also on the FBI's most wanted list in the late 1960s after escaping from prison where he was serving time for bank robbery.
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