Fifty-one-year-old Michael Gressett faces 12 felony charges and adamantly denies the allegations. His lawyer says Gressett and his accuser had a romantic relationship.
Authorities say the Contra Costa County prosecutor attacked a fellow deputy district attorney at his home in May.
He was arrested last month, and state prosecutors took over the case because of the potential conflict of interest.
He could face life in prison if convicted of all counts. He is free on $1 million bail and remains on paid leave.
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