SEEKING DIVORCE. Mary Tyler Moore, 43, superb TV comedienne who shone when she branched out to Broadway (Whose Life Is It Anyway?) and Hollywood (Ordinary People); and Grant Tinker, 54, TV producer and co-founder with Moore of MTM Enterprises; after 18 years of marriage, no children; in Los Angeles.

DIED. Tim Hardin, 40, jazz-influenced folk singer and songwriter (If I Were a Carpenter, Find a Reason to Believe) whose bittersweet ballads were popularized--with far greater commercial success than Hardin achieved--by such performers as Bobby Darin and Rick Nelson; of unknown causes; in Hollywood.

DIED. Tony Smith, 68, sculptor noted for his huge geometric steel structures; of a heart attack; in New York City. Said Smith of his monumental minimalist works: "My sculptures are on the edge of dreams. They come close to the unconscious in spite of their geometry."

DIED. Marshall McLuhan, 69, author, educator and apostle of the electronic age, whose impact he proclaimed in his famous aphorism, "The medium is the message"; in Toronto (see TELEVISION).

DIED. Alec Wilder, 73, idiosyncratic composer who was equally adept at wistful popular songs (It's So Peaceful in the Country, I'll Be Around, While We're Young) and unfashionably melodic orchestral and chamber works, and whose 1972 book, American Popular Song, showed him to be a gifted writer as well; of lung cancer; in Gainesville, Fla.

DIED. Sam Levene, 75, the original Nathan Detroit in the 1950 Broadway musical Guys and Dolls, who specialized in playing irascible but appealing characters in more than 100 other plays and films; of a heart attack; in New York City.

DIED. Nadezhda Mandelstam, 81, doughty widow of the major Russian poet Osip Mandelstam, who preserved her husband's work after his death in a concentration camp in 1938, making possible the 1974 publication of a small selection of his poetry in the Soviet Union; of heart disease; in Moscow. Her own memoirs, Hope Against Hope (1970) and Hope Abandoned (1974), powerful chronicles of life in Stalinist Russia, had to be smuggled out of the U.S.S.R. to be published.

DIED. Ray H. Jenkins, 83, Tennessee lawyer who was the tough, evenhanded counsel to a Senate subcommittee during its 1954 hearings on charges that Senator Joseph R. McCarthy had sought special treatment from the Army for a former aide; of pneumonia; in Knoxville, Tenn.

DIED. Karl Doenitz, 89, grand admiral who commanded Nazi Germany's dreaded U-boat "wolf packs"; of heart disease; in Aumuehle, West Germany (see WORLD).

DIED. Marc Connelly, 90, playwright, bon vivant and raconteur whose 1930 play The Green Pastures, depicting Old Testament stories as they might have been enacted by Southern plantation blacks, is one of the enduring triumphs of the American theater; in New York City. An early collaborator of George S. Kaufman and one of the circle of wits at the Algonquin Round Table in the 1920s, he later turned to directing, writing and traveling.

DIED. Raoul Walsh, 93, prolific movie director who won acclaim for such silent film classics as What Price Glory? and Sadie Thompson before mastering the high-adventure thriller (They Drive by Night, High Sierra) that helped establish the tough-guy images of Humphrey Bogart, James Cagney and George Raft; of a heart attack; in Simi Valley, Calif.

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