Conversation so far:
How was Rubin Carter's career?
After his release from prison in September 1961, Carter became a professional boxer.
Was Rubin Carter good at boxing?
Rubin Carter's aggressive style and punching power drew attention, establishing him as a crowd favorite and earning him the nickname Hurricane.
Did Rubin Carter win any boxing tournaments?
Rubin Carter's career record in boxing was 27 wins, 12 losses, and one draw in 40 fights, with 19 total knockouts.
Did Rubin Carter have any sponsors during his boxing career?
Are there any other interesting aspects about the Rubin Carter article besides whether he won any boxing tournaments?
Rubin Carter received an honorary championship title belt from the World Boxing Council in 1993 and was later inducted into the New Jersey Boxing Hall of Fame.

Question: When did he retire from boxing?
Self-contained rewrite: When did Rubin Carter retire from boxing?