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A man living in Mexico became a suspect in Sue Marcum’s murder after police linked his DNA to evidence at the crime scene back in Maryland. Investigators say he taunted officers through email, at one point telling them to “bring your Kevlar.” Watch John Quiñones' ALL-NEW 20/20 report, 'The Hunt for Mr. Right' premiere tonight (Jan. 16) at 9/8c on ABC. Stream later on Disney and Hulu. | ABC 20/20
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