One of the most aspirational A-list couples of the 20th century was Johnny Cash and June Carter; just take the letter he sent to her on her 65th birthday in 1994, which was later voted the greatest love letter of all time.
Yet their romance began in murky waters, as they were both spoken for when their affair began.
Johnny was married to Vivian Liberto at the time, and they shared four daughters, while June was married to policeman Edwin Nix, and they shared a daughter.
Johnny and June first met in 1956 when he made his debut at the Grand Ole Opry, and her first husband, singer Carl Smith...
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