Scrappy lightweight fighter nicknamed El Temible held the WBC and The Ring championship on multiple occasions.
He won his professional debut in 1990 and went on to win his first 18 fights.
He earned Fight of the Year honors from the BWAA and The Ring for his 2005 bout with Diego Corrales.
He grew up with 8 siblings in Mexicali.
He had two controversial losses to Floyd Mayweather in 2002.