FOXSports.com first announced the news, which was then confirmed by UFC officials.
Kennedy (16-4) lost his initial opponent Lyoto Machida last week when an eye injury caused Michael Bisping's withdrawal from UFC Fight Night 30's main event, which led to Machida's subsequent selection as a replacement.
Natal (17-4-1) slips into his first headlining gig in the midst of a three-fight win streak, punctuated by a ‘Fight of the Night' victory over TUF 17's Tor Troeng in September. The 30-year-old has quietly won five of his last six contests, stumbling only to an Andrew Craig head kick last July.
UFC Fight Night 31 takes place November 6, 2013 at Fort Campbell in Fort Campbell, KY. An updated fight card can be seen below.