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Robert Stone, best known for Dog Soldiers and A Flag for Sunrise, has died, according to a statement from his literary agent made to the Associated Press. The award-winning author died Saturday at his home in Key West, Fla. of chronic obstructive pulmonary disease.

Stone’s career spanned nearly five decades. He authored 11 literary works including a memoir titled Prime Green: Remembering the Sixties. In 1975, Stone won the National Book Award for Dog Soldiers and A Flag for Sunrise, published in 1981, would go on to be a finalist for the Pulitzer Prize. It was also nominated for the National Book Award twice, as a hardcover and paperback.

His last completed work, Death of the Black-Haired Girl, was published in 2013. His agent said that before his death, Stone was working on a new novel—but there’s no word yet on whether it will be published.