Andrea Canning Previews: The Alibi

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Andrea Canning reports on the homicide of private first class soldier and young mother Karlyn Ramirez. Plus, a glimpse into the FBI's crime lab and an in-depth look at how multiple agencies uncovered a plot that spanned several states and prompted suspicions of espionage. Watch an all-new Dateline Friday, January 11 at 10/9c on NBC.