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When a woman disappears, her abusive ex-boyfriend becomes a suspect. But a set of keys point in another direction.
The case of Michelle Anne Harris, a New York woman who went missing in 2001. Several men, including her estranged husband, were suspected, but the case went unsolved until a slip of the tongue led to an arrest.
When a real estate developer is shot to death, circumstantial evidence points to his wife. But investigators identify the gun after discovering a non-fatal bullet that was fired nearly two decades earlier.