Roberta McCain, the mother of late Arizona Sen. John McCain, has died on Monday at the age of 108. “It is with great sadness that I announce the death of my wonderful Mother In-law, Roberta McCain. I couldn’t have asked for a better role model or a better friend. She joins her husband Jack, her son John and daughter Sandy,” Cindy McCain, her daughter-in-law, said in a Monday tweet announcing the news. Details of how the 108-year-old matriarch of the McCain dynasty died have not yet been released. Sen. John McCain, once a Republican presidential nominee and long-term Arizona senator, died in August 2018 of brain cancer.

Born in 1912, McCain was an oil heiress who was married to one of the Navy’s highest-ranking officers, Admiral John S. McCain Jr., The Washington Post reports. The 108-year-old emerged as a public figure when John McCain ran for the Republican presidential nomination for a second time in 2008, traveling around the country with him on the campaign trail. The Post reports that in a 2008 interview, McCain explained that Republicans unhappy her son’s independent nature would have to “hold their noses”—and vote for him.