DIED. Michael Bloomfield, 37, innovative electric guitarist who, as a featured performer with such groups as the Chicago-based Paul Butterfield Blues Band and the Electric Flag and American Music Band during the 1960s, was a leader in the rock-infused revival of urban blues, a style epitomized by B.B. King and Muddy Waters; of a possible drug overdose; in San Francisco.

DIED. Karl Richter, 54, German conductor, harpsichordist and organist who founded the Munich Bach Choir and Orchestra, through which he became internationally known for his rigorous, emotional interpretations of Bach and as a leader of the Bach-Handel revival of the '50s and '60s; of a heart attack; in Munich. Richter, who in recent years was himself labeled a romantic by more severely "authentic" Bach interpreters, attributed the zeal for authenticity to "a certain snobbishness" and said: "As a whole, properly performed, Bach always will stay right in the spirit of the present."

DIED. Joseph W. Kaufman, 81, New York City-born lawyer and judge who won acclaim in 1947-48 as the meticulous chief prosecutor in the trial of Alfried Krupp and eleven other executives of the Krupp armaments empire at Nuremberg; of heart disease; in Washington, B.C. Kaufman, who later served as a special master for the U.S. court of appeals, prosecuted the defendants on grounds of "waging aggressive war" against Jews and other civilians. He settled for convictions on charges of plunder and slave labor and sentences of up to twelve years.

DIED. John Knudsen Northrop, 85, aviation pioneer and founder of Northrop Corp., who designed such celebrated planes as the original Lockheed Vega (in which Amelia Earhart made her historic solo transatlantic flight in 1932), the night-flying P-61 Black Widow fighter in World War II and the revolutionary boomerang-shaped Flying Wing; of pneumonia; in Glendale, Calif. Northrop, who was also a co-founder of Lockheed Corp. in 1927 before starting his own firm in 1939, blamed manufacturing disputes with the Air Force, not problems of flight stability, for the fact that he never realized his dream of mass-producing a Flying Wing bomber.

DIED. Henry S. Huntingdon, 99, onetime Presbyterian minister who became a pioneer of nudism in the U.S., serving as the first editor of the movement's magazine (then called the Nudist) and helping to establish one of the country's first nudist camps, at Otis, Mass.; in Philadelphia. Huntington, who declared himself an agnostic humanist when he resigned his ministry in 1938, maintained that nudism affirmed "the goodness of man and the possible satisfactoriness of life."

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