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
Miriam Marx father. She died at the age of 90 in 2017. Miriam Marx Miriam Marx Allen (May 19, 1927 – June 29, 2017) was an author and the daughter of Groucho Marx, and his first wife, Ruth Johnson. Her elder brother was Arthur Marx. Her married name was Miriam Allen. Besides having worked for a time on the writing staff of her father's quiz show "You Bet Your Life" during the 1950s, she later appeared in several Marx Brothers documentaries. In her book, "Love Groucho: Letters from Groucho Marx to His Daughter Miriam", she detailed her difficult relationship with Groucho, her