Born. To Jane Fonda, 35, Oscar-winning actress (Klute) and militant champion of such liberal causes as Indian rights and Women's Lib, and her husband since January, Tom Hayden, 33, one of the Chicago Seven and most recently a witness for the defense in the Pentagon papers trial: their first child, a son; in Los Angeles. Name: Troy O'Donavan Garity.

Marriage Revealed. Diana Rigg, 33, British actress who played the sultry, liberated karate expert of television's The Avengers; and Israeli Artist Menachen Gueffen, 43; she for the first time, he for the second; in London; on July 6. Trained originally as a Shakespearean actress, since 1972 Rigg has been a leading lady with England's National Theater Company.

Married. Ali MacGraw, 34, the willowy Wellesley graduate whose acting (Love Story) is still accidental; and The Getaway rebel Steve McQueen, 43; she for the third time, he for the second; in Cheyenne, Wyo. McQueen summoned a justice of the peace from a golf course to a city park to perform the ceremony, which was attended by McQueen's son and daughter and MacGraw's son by her second husband, Robert Evans, vice president in charge of production at Paramount Pictures.

Died. Robert Ryan, 63, ruggedly good-looking actor with a talent for violent roles; of lung cancer; in Manhattan. Among Ryan's best performances in a screen career that spanned 30 years and some 90 films: the aging, failing prizefighter in The Set-Up (1949) and an anti-Semitic Marine in Crossfire (1947). Onstage he scored more recent triumphs in a Broadway revival of The Front Page (1969), in which he played the cynical managing editor, Walter Burns, and as the father in Eugene O'Neill's Long Day's Journey into Night (1971).

Died. Lon Chancy Jr., 67, son of Hollywood's greatest movie monster and something of a real horror in his own right; in San Clemente, Calif. Chaney, originally a character actor, created the role of the Wolf Man. But among his finest performances were Lennie, the clumsy, stupid giant in John Steinbeck's Of Mice and Men (1940), and the arthritic marshal in High Noon (1952).

Died. Frederick Marcus Warburg, 75, sportsman, philanthropist, and for 42 years an internationally minded senior partner and so-called "foreign minister" of Kuhn, Loeb & Co., one of Wall Street's oldest and most powerful banking and investment firms; of heart disease; in Winchester, Va.

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