According to his representative the actor died on Friday after a short illness, reported People magazine.
After beginning his career in Nashville in the late 1960s and signing a songwriting contract in the early 1970s, Williams made his chart debut with "The Shelter of Your Eyes" in 1973.
Over the course of his decades-long career, the so-called "Gentle Giant" of country music recorded hits like "Tulsa Time," "Good Ole Boys Like Me," and "It Must Be Love."
Williams held his final performance and retired in 2016, saying it was time to "hang up his hat and enjoy some quiet time at home."