Marciano Defeats Joe Louis On October 26, 1951, with 37 wins and 32 knockouts under his belt, Marciano faced his most formidable opponent in former heavyweight champion Joe Louis. Louis was past his prime and when Marciano knocked him out in the eighth round, he had such mixed feelings at beating his hero that he cried in Louis’s dressing room after the fight. Sentiment aside, however, the fight established Marciano as one of the marquee fighters in the heavyweight division, and assured him of a title shot before too long. 
Retired from Boxing On April 27, 1956 Marciano retired from boxing at the age of 31. “I thought it was a mistake when Joe Louis tried a comeback,” The New York Times quoted him as saying. “No man can say what he will do in the future, but barring poverty, the ring has seen the last of me. I am comfortably fixed, and I am not afraid of the future.” He said he wanted to spend more time with his family; it has been said since that he resented having to pay 50 percent of his earnings to his manager. 
(source:blog.baaclothing.com) The Last Years Marciano spent the years following his retirement making money from personal appearances. Notoriously frugal, Marciano insisted on bumming rides from friends with private planes, even though he could usually be given paid transportation to and from any of his personal appearances. On August 31, 1969, the day before his 46th birthday, he died in a private-plane crash near Des Moines, Iowa. He was survived by his wife of 19 years, Barbara, and two children, Rocco Kevin and Mary Anne. (source: biography.yourdictionary.com/rocky-marciano)
