Mexican boxer Jesus "Chucho" Castillo, a one-time world bantamweight champion best known for his rivalry with countryman Ruben Olivares, has died. He was 67.

Castillo passed away Tuesday afternoon in Mexico City due to complications following gastric surgery, prompting the World Boxing Council to declare three days of mourning in his honor.

The holder of the WBC and WBA bantamweight crowns in the early 1970s, Castillo never lost a fight by knockout and had a career record of 42-18 with two draws.

He fought of series of three fights at the Forum in Inglewood, California, between 1970 and 1971 against Olivares - a member of the Boxing Hall of Fame - that forever linked the two pugilists.

In their first bout on April 18, 1970, Olivares defeated Castillo by decision to successfully defend his WBC and WBA crowns, while in the second - on Oct. 16, 1970 - Castillo won by technical knockout in the 14th round to hand his opponent his first-ever defeat in 62 fights.

In the April 2, 1971, rubber match, Olivares won back his titles with a 15-round decision.

Castillo's other main rivals included Japan's Seiichi Watanuki, Nicaragua's Vicente Blanco and American Danny Lopez. EFE