A group of men were behind dozens of robberies in Prince George’s County, Maryland. One of them began murdering pairs of mothers and daughters. On January 26, 2009, 16-year-old Karissa Lofton called 911 from her home in Upper Marlboro, Maryland, about 20 miles southeast of Washington D.C. In a chilling recording of the teen speaking to dispatchers, played in "The Unusual Suspect" episode of Dateline: The Smoking Gun, she said someone had shot her and her mother, 45-year-old nurse Karen Lofton.