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Michelle McNamara: Citizen sleuth

| CBS News correspondent Tracy Smith discusses the active role that Michelle McNamara, a writer married to the comedian Patton Oswalt, took to investigate the Golden State Killer, and how it may just be the key to solving the 40-year-old case. Learn more about the investigation on an all-new "48 Hours" airing Saturday, April 22 at 10/9c on CBS.