A lost diary and a mysterious phone call cause conspiracy theorists to wonder if Mary knew too much. If so, did the CIA take her out? The theories might seem far-fetched. But unsolved murders beg for explanation - it's embedded in our psychology to want answers.

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Murder on the Towpath with Soledad O’Brien

One of America’s greatest unsolved mysteries, and the two women at its core; One black, one white. O… 

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