Marietta had started an affair with Adlai Stevenson between his two failed presidential campaigns, but her husband was unfazed by this, as the couple's marriage had largely disintegrated to a friendly separation, with Tree spending much of his time at Heron Bay, his house in Barbados. Marietta had turned down the option of returning to her earlier lover, the director John Huston, even when he had given her a role in his 1960 movie "The Misfits". It was while walking in London with Marietta that Adlai suffered a heart attack, and later died at St. George's Hospital. That night in her diary, Marietta wrote, "Adlai is dead. We were together."