Doug (Douglas) McCain, the eldest son of the late U.S. Senator John McCain, dies at 66, according to family announcements reported by multiple outlets. CBS News and others say the family confirms his death, while Mint and Fox News report that Meghan McCain, his sister, shared the news in a public tribute. The reports describe Doug McCain as a retired Navy pilot, with the New York Post and Fox News specifically identifying him as having served in the U.S. Navy. Daily Mail similarly reports that he dies suddenly at age 66. Mint adds that the cause of death is not disclosed. Across the coverage, the central points are that his family announces his death, that he is 66 years old, and that Meghan McCain publicly acknowledges his passing and character in a tribute. While the outlets differ slightly in phrasing—such as “dies suddenly” versus simply “dies”—they do not provide additional confirmed details about the circumstances surrounding his death beyond the reported omission of a disclosed cause.