Writer Nigel Nicolson, who documented his famous parents' same-sex affairs in the 1973 book Portrait of a Marriage, has died, according to The Washington Post. Nicolson, 87, died September 23 at his country estate in England; the cause of death was not disclosed. Among his many accomplishments--including the original publication of Vladimir Nabokov's controversial Lolita in the United Kingdom--Nicolson was perhaps best known for Portrait, which he wrote about his famous parents: Sir Harold Nicolson, a prominent diplomat and member of parliament, and Vita Sackville-West, who was famous for her liaisons with other women, particularly author Virginia Woolf, who wrote Orlando for Sackville-West. Nicolson served in the British army during World War II, was a member of parliament himself from 1952 to 1959 and published his memoirs, Long Life, in 1997. His final book, a collection of his father's letters, was published three weeks before his death. Divorced from his one wife, Philippa Tennyson d'Eyncourt, Nicolson is survived by two daughters and a son, writer Adam Nicolson.