Meghan McCain's brother has died "suddenly" at the age of 66.
Douglas - the eldest child of the late Senator John McCain - passed away "suddenly" on May 20, and former View host Meghan paid tribute to her "truly wonderful" sibling on May 23.
She posted a shot of Douglas standing beside John, with the caption: "I am deeply saddened to share the news of my brother Doug McCain’s sudden passing.
"He was a truly wonderful, joyful man who supported me throughout my life. He brought humour, fun, and great conversation to every room. I will cherish our memories together.
"Our prayers are with his wife, Ashley, and children Caroline and Shepp."
Meghan, 41, did not reveal Douglas' cause of death.
As well as his wife and children, Douglas is survived by his mom, Carol McCain, 88, as well as his siblings and step-siblings.
Meghan's fans expressed their condolences in the post's comments section, as one penned: "I am so sorry Meghan. I have heard it said that the death of a sibling is like losing a part of yourself + your history. I have found that this is true.
"I wish you and your family peace and strength during this sad time."
A second supporter typed: "Meghan, I know that no amount of words would help in this horrible time. But, please know you are loved and that there are so many people to lean on. My most sincere condolences for you and your entire family."
And a third follower wrote: "I flew with Doug for years at American Airlines, and am so saddened by his passing. He was a wonderful person, pilot, and friend to all who worked with him. God Bless him and his family."
The McCain Institute took to X on May 23 to pay tribute to Douglas.
Its post read: "We extend our condolences to the McCain family following the passing of Douglas 'Doug' Shepp McCain, the eldest son of John McCain.
"A Navy pilot like his father, Doug will be remembered as a patriot and friend to the many alumni of Sen. McCain’s Institute, campaigns + Senate staff."
Born in Pensacola, Florida, Douglas was the eldest son of Carol McCain, John's first wife, whom he married in 1965 and divorced in 1980.
John - who died from glioblastoma in August 2018 at the age of 81 - adopted Douglas and his brother, Andrew, after he got hitched to Carole, and they welcomed their daughter, Sidney, into the world in 1966.
Douglas met his wife, Ashley, in college, and after he graduated in 1982, he joined the Navy before he worked for American Airlines.
