When 52-year-old American University accounting professor Sue Marcum was found dead at the bottom of the stairs inside her upscale Bethesda, Maryland, home in 2010, her murder made headlines. Medical examiners ruled her death a homicide caused by blunt-force trauma and asphyxiation. DNA evidence found underneath her fingernails signaled a possible struggle with an attacker. But what initially appeared to be a burglary gone wrong soon took a darker turn when authorities focused on a former boyfriend. John Quiñones follows the trail of an international fugitive with exclusive interviews and unprecedented access inside the case in the all-new 20/20 episode “The Hunt for Mr. Right,” streaming on Disney+ and Hulu, under Season 48, Episode 13.
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