Paul Murdaugh was charged with felony boating under the influence after investigators said he was driving a boat that crashed and killed 19-year-old Mallory Beach who was on board.
Alex Murdaugh didn't cry over dead wife and son, first officer on scene says
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He said he'd been gone for an hour to visit his ailing father and mother.
Alex Murdaugh goes on trial in 2021 killings of wife, son
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