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A woman repeatedly threatened to kill her ex. She enlisted her father to help make good on her promise. Why couldn't anyone stop her? "48 Hours" correspondent Peter Van Sant reports.
A brutal murder and police have DNA evidence — could a discarded cigarette lead investigators to a possible killer and close a case two decades later? CBS News correspondent Anne-Marie Green reports.
An inside look at the startling evidence that helped convict against Colorado man Patrick Frazee for the murder of his fianceé. CBS News correspondent Nikki Battiste reports.