WASHINGTON (CNN) -- Laura Neuman was raped when she was 18 years old. It took nearly 20 years to identify her attacker, even though he'd been arrested six times before her attack and at least six times afterward.
Alphonso Hill pleaded guilty in September 2002 to raping Neuman and was sent to prison for 15 years. A DNA sample, taken in prison, led to charges in six other rape cases.
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