Terry McGovern
This American boxer started his career in 1897 and continued fighting until around 1906. McGovern died at a tragically young age from illness. After he retired he struggled with mental illness as well as working. He took odd jobs for the most part up until his death.
Jose Napoles
Having fought in 88 fights, Jose Napoles won 81 of them, 54 of them by KOs. He was debuted as a professional boxer in 1958, and he retired 1975. This legendary boxer only lost 7 of the fights he was in.