Johnny Acosta is no stranger to violence.
He's been locked up for voluntary manslaughter, attempted rape and assault, among other things.
And on Thursday, the Hesperia man pleaded not guilty to killing a former U.S. Marine who had recently returned from his third tour in Iraq and was working as a cable technician.
Trevor Neiman, 25, was called to a San Jose Drive home in Victorville on Monday afternoon to install cable. While he was working in the living room, authorities say Acosta suddenly grabbed a ball-peen hammer and beat Neiman to death.
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