Nicknamed 'Cochulito,' he held titles in the WBO Flyweight, WBO Super Flyweight, and WBO and WBC Bantamweight divisions.
His nickname was given to him by his little sister, who couldn't pronounce him name.
He combined instincts, smarts, and technical ability to find ways to defeat his opponents.
His four brothers were also professional fighters.
In one of the greatest fights of the decade, he squared off against champion Nonito Donaire.