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Despite being thrown into the public eye for most of her marriage to a country music star, Johnny Cash's first wife was all but forgotten by Hollywood. But in a new documentary available for a limited time on Amazon, her daughters set the record straight. "My Darling Vivian" filmmakers Matt Riddlehoover and Dustin Tittle (the grandson of Johnny Cash) tell CBSN's Reena Ninan the untold story of Vivian Liberto.