Engaged. John Daley, 28, sixth of Chicago Mayor Richard Daley's seven children; and Mary Lou Briatta, 28, daughter of Louis Briatta, an ex-barber once linked to gambling in the Loop. The romance bloomed last winter amid the bumper stickers of campaign headquarters, where young John, a prospering insurance broker, helped with hizzoner's re-election drive and Ms. Briatta served as a volunteer.

Married. Malcolm McDowell, 31, intense, puckish British film star (If, A Clockwork Orange, O Lucky Man!); and Margot Dullea, 33, ex-wife of Actor Keir Dullea; he for the first time, she for the second; in London.

Died. Ranieri Mazzilli, 65, Acting President of Brazil briefly during the 1960s; following surgery; in Sao Paulo. Mazzilli first occupied the presidential palace during a tense 1961 impasse (when conservative soldiers threatened to block the accession of Leftist Vice President Jo`ao Goulart) helping to reconcile the conflict and avert civil war. He again served as President--for twelve days--following the 1964 overthrow of Goulart.

Died. Percy L. Julian, 76, prolific black research chemist; of cancer; in Waukegan, Ill. Grandson of a slave, Alabama-born Julian won honors at Harvard and the University of Vienna on his way to garnering over 130 chemical patents. His pioneering work with soybeans led to discoveries ranging from a drug for treating glaucoma to aerofoam, the Navy's fire-extinguishing "bean soup" of World War II. But he was best known for his low-cost method of synthesizing cortisone, which made him both a millionaire and a major financial angel to the civil rights movement.

Died. Jacques Duclos, 78, veteran French Communist; of a heart attack; in Paris. Wounded and captured at Verdun in 1917, the roly-poly, bespectacled Duclos, a baker's apprentice before the war, joined the party in 1920, working first as an agitator among soldiers and draftees, and later earned the reputation of a political wunderkind by defeating Socialist Leon Blum for the Assembly. An orthodox Stalinist, Duclos gained leverage in the Communist International, virtually directed the 1946 expulsion of onetime U.S. Party Boss Earl Browder for continuing his wartime policy of soft-pedaling the "class struggle." After the Nazis invaded Russia, he organized the French Communist resistance and led its August 1944 insurrection in Paris, emerging from the war as one of the French party's most powerful figures and its presidential candidate against Georges Pompidou in the 1969 election.

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