The artist Yoko Ono, the widow of the late former Beatle John Lennon, was admitted to a New York City hospital on Friday after complaining of severe flu-like symptoms, her West Coast-based spokesman said. Spokesman Elliot Mintz denied U.S. media reports that Ono, 83, had suffered a possible stroke or heart attack, and said he understood she would be released from the hospital on Saturday. Ono had called her doctor, who said her symptoms sounded like the flu, and advised her to go to the hospital as a precaution, Mintz said.