Divorced. Hugh Fraser, 58. British Member of Parliament; and Lady Antonia Fraser, 43, bestselling author (Mary Queen of Scots Cromwell: The Lord Protector); after 20 years of marriage, six children; in London. Eraser's suit for divorce was not contested by Lady Antonia, who has been living with Playwright Harold Pinter for more than a year. Pinter's wife. Actress Vivien Merchant, named her Ladyship corespondent in a suit in 1975, but has since decided not to press for a divorce.

Died. Jack Cassidy, 49, actor and singer; in a fire in his apartment; in West Hollywood, Calif. A Queens, N.Y., native, Cassidy first hit Broadway in a chorus line at the age of 16; he later starred in several musicals, including his 1963 Tony Award-winning performance in She Loves Me. His preening charm and Irish good looks were also prominent in plays, films, television and supper clubs. Cassidy often appeared with Shirley Jones, to whom he was married for 18 years before their divorce last year. His son. Singer David Cassidy, was born during his earlier marriage to Actress Evelyn Ward.

Died. Elmyr de Hory, 65, master art forger; by his own hand (sleeping-pill overdose); on the Spanish island of Ibiza. Hungarian-born De Hory painted under his own name until 1946, when he sold a small "Picasso" that he had executed. With the aid of a skillful fence, he turned his mimicry of Matisse, Modigliani and others into millions of dollars until his cover was blown in 1967. The dapper De Hory was the subject of Fake!, a 1969 biography by his friend Clifford Irving -no mean hoaxer himself -and a movie by Orson Welles. In recent years he sold his own works for large sums, but the authorities still pursued him for past fakeries. Last week he was told that he would be extradited to France to stand trial for his part in a $1.3 million sale of forged works to a Texas art collector in 1964-66.

Died. Donald H. Menzel, 75, one of the world's leading authorities on the sun; in Boston. Menzel observed his first solar eclipse as a boy in Colorado, and spent the rest of his life studying the sun and its corona. A member of the Harvard faculty for nearly 40 years. Menzel watched 15 total solar eclipses, leading expeditions to Siberia, the Sahara and other remote outposts to get the best views. In 1938 he developed the U.S.'s first coronagraph, a telescopic device that allows scientists to study the sun's glowing halo without the help of an eclipse. Menzel was a prolific author of scientific books and science fiction, and an accomplished doodler, whose sketches have been exhibited widely.

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