Comedian Jonathan Winters, whose manic improvisational genius never seemed to take a rest, has died at the age of 87 after a more than 50-year career in stand-up, on television and in film. The burly, moon-faced Winters, a major influence on contemporary comedians like Robin Williams and Steve Martin, died on Thursday of natural causes at his Montecito, California home, surrounded by family and friends, said long time family friend Joe Petro III