Cannon retired to San Francisco. He died in Norwalk, Connecticut on September 3, 1976, after being stricken while visiting his daughter JoAnne Schwartz in Wilton, Connecticut.Social Security Death Index entry, Robert M. CannonNewspaper article, Gen. R.M. Cannon dies in Norwalk, The Hour (Norwalk, Connecticut), September 7, 1976 He was buried in San Francisco National Cemetery, Plot H-35.Nationwide Gravesite Locator, U.S. Department of Veterans Affairs
