Celebrated author, playwright and commentator Gore Vidal has died at the age of 86, his nephew has said.
Burr Steers said Vidal died at his home in Los Angeles' Hollywood Hills on Tuesday of complications from pneumonia. Mr Steers said Vidal had been living alone in the home and had been sick for "quite a while".
The acerbic Vidal was known for such best-selling novels as Burr and Myra Breckenridge, the play The Best Man, and for essays on everything from politics and literature to sex and religion.
In the 1960s and 70s he was a fixture on talk shows and other television programmes and feuded openly with Norman Mailer, William Buckley and others. He also worked on screenplays and appeared in several films, including Bob Roberts.
Along with such contemporaries as Norman Mailer and Truman Capote, Vidal was among the last generation of literary writers who were also genuine celebrities, personalities of such size and appeal that even those who had not read their books knew who they were.
His works included hundreds of essays; best-selling novel Lincoln; the groundbreaking The City And The Pillar, among the first novels about openly gay characters; and the Tony-nominated political drama The Best Man, revived on Broadway in 2012.
Tall and distinguished looking, with a haughty baritone not unlike that of his conservative arch-enemy Buckley, Vidal appeared cold and cynical on the surface. But he bore a melancholy regard for lost worlds, for the primacy of the written word, for "the ancient American sense that whatever is wrong with human society can be put right by human action".
Vidal was uncomfortable with the literary and political establishment, and the feeling was mutual. Beyond an honorary National Book Award in 2009, he won few major writing prizes, lost both times he ran for office and initially declined membership into the American Academy of Arts and Letters, joking that he already belonged to the Diners Club. He was eventually admitted in 1999.
He picked apart politicians, living and dead, mocked religion and prudery, opposed wars from Vietnam to Iraq and insulted his peers like no other, once observing that the three saddest words in the English language were "Joyce Carol Oates" (The happiest words: "I told you so").
Vidal had an old-fashioned belief in honour, but a modern will to live as he pleased. He wrote in the memoir Palimpsest that he had more than 1,000 "sexual encounters", nothing special, he added, compared with the pursuits of such peers as John F Kennedy and Tennessee Williams. Vidal was also fond of drink and claimed that he had sampled every major drug, once. He never married and for decades shared a scenic villa in Ravello, Italy, with companion Howard Austen.