i feel bad for the guy. he hasn't been the same since his sister disappeared. i didnt realize that she was presummed dead this year back in march. thats gotta be a tough thing to bounce back from. and im sure fighting is like all he knows so it's gotta be hard on the guy to just stop.
check this out from his wikipedia page
His next major fight was on February 2, 2004 against Randy Couture, a rematch, after Vitor lost the first. Despite agonizing over his sister Priscila Belfort who disappeared on January 9, Vitor won the fight in 49 seconds when a seam from his glove cut Couture's eyelid, prompting a referee stoppage. Another rematch took place on August 21, 2004. Couture didn't consider that fight to be the rubber match, but rather a continuation of the second fight. Couture won via doctor stoppage after the third round, due to accumulated punishment and a cut which was opened by Couture. (As of March 28, 2006, Priscila is presumed by Brazilian authorities to have been kidnapped and killed, by suspected drug dealers.[1])

