MARRIED. Michelle Phillips, 33, lissome blonde Hollywood actress (Valentino) who was a singer with the 1960s' Mamas and Papas folk-rock group; and Robert Stephen Birch, 30, a broadcasting executive; she for the third time, he for the first; in Beverly Hills.

MARRIED. James L. Browning Jr., 45, former U.S. Attorney who prosecuted Patty Hearst for bank robbery, and is currently seeking the Republican nomination for California attorney general; and Linda Miltner, 35, a teacher's aide; both for the second time; in Hillsborough, Calif.

DIVORCED. Princess Margaret, 47, younger sister of Britain's Queen Elizabeth; and Lord Snowdon, 48, a photographer raised to the peerage after their Westminster Abbey wedding; after 18 years of marriage, two children; in London. The routine two-minute court hearing granted the first divorce to an immediate member of the British royal family since 1540, when Henry VIII divorced Anne of Cleves.

DIED. Joseph A. Colombo Sr., 54, Brooklyn Mafia chieftain who became the outspoken founder of the Italian-American Civil Rights League; as a result of gunshot wounds suffered at a 1971 league rally in Manhattan; in Newburgh, N.Y. After a lackluster youth as a petty criminal in the underworld, Colombo became an efficient member of a five-man assassination squad under one of the Mafia bosses. Assigned in 1963 by another chieftain to murder reputed Godfather Carlo Gambino and two other high-ranking bosses, Colombo decided his victims would be worth more to him than his contract and tipped them off. Gambino awarded him a place on the Mafia's supreme council, the Commission, but Colombo was shunned as a stool pigeon and small-time hood by other leaders. Police speculated that his violation of the Cosa Nostra's traditional oath of silence, with his highly visible activities in the league (one aim of which was the elimination of the word Mafia from the U.S. lexicon), triggered the assassination attempt that left him almost completely paralyzed.

DIED. Robert Bradshaw, 61, highhanded Prime Minister of St. Kitts-Nevis-Anguilla, a trio of West Indian islands knit together as a British associated state; of cancer; in Basseterre, St. Kitts. In a troubled climate of high unemployment with a flimsy sugar-cane economy, Bradshaw clung to power chiefly because of his adaptability. A onetime bicycle mechanic and cane cutter, he rose as a labor organizer, attained political power and preached nationalism while flaunting cutaways and a yellow Rolls-Royce. When Britain's colonial hold eased in 1967, Bradshaw was voted into the first of three terms as Prime Minister and, sensing opposition to his posh lifestyle, decelerated to khakis and a Land Rover.

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