D. C. Superior Court Judge Joseph N. Hannon ruled yesterday that author Bob Woodward is not "material or necessary" in the upcoming case against Cathy Evelyn Smith, who is charged in the death of superstar John Belushi. Smith's attorneys had subpoenaed Washington Post assistant managing editor Woodward, seeking any material, notes, memos, recordings, diaries and other resource materials he used in writing his bestselling book, "Wired: The Short Life and Fast Times of John Belushi." The judge did say that Smith's lawyers could ask again for the subpoena if they had new information. Woodward described the ruling as a victory for the First Amendment . . .

Lionel Olmer, undersecretary of commerce for international trade, was one of 16,000 to complete Sunday's London marathon, finishing in 3 hours and 53 minutes. The 50-year-old runner, on his way home from an Organization for Economic Cooperation and Development meeting on the continent, decided he had time to run a bit . . .

Representatives from the embassies of the Soviet Union, the Vatican, and Latin American, Arabic and European countries visited the Brazilian embassy yesterday to sign the condolence book for Brazil's President-elect Tancredo Neves, who died Sunday. President Reagan sent his condolences to the embassy yesterday to be delivered to the country's new leader, Jose Sarney, saying he had been impressed with Neves' "human warmth and intellectual insight" . . .