Marx Brothers made a guest appearance to introduce the "Tonight Show's" new host, Johnny Carson. Around 1960, the acclaimed director Billy Wilder considered writing and directing a new Marx Brothers film. Tentatively titled "A Day at the U.N.", it was to be a comedy of international intrigue set around the United Nations building in New York. Wilder had discussions with Groucho and Gummo, but the project was put on hold because of Harpo's ill-health and abandoned when Chico died in 1961. He was 74. Three years later, on September 28, 1964, Harpo died at the age of 75 of a heart attack
Marx Brothers warns him that he "can't burn the candle at both ends," a candle burning at both ends. During this period Chico and Groucho starred in a radio comedy series, "Flywheel, Shyster and Flywheel". Though the series was short lived, much of the material developed for it was used in subsequent films. The show's scripts and recordings were believed lost until copies of the scripts were found in the Library of Congress in the 1980s. After publication in a book they were performed with Marx Brothers impersonators for BBC Radio. Their last Paramount film, "Duck Soup" (1933), directed by the highly