The boxing world bid farewell to one of its hardest veterans this week, as Ruben “The Conquistador” Castillo died on Wednesday, February 25, 2026, at 68 after a lengthy battle with cancer. He passed peacefully at his home in Beaumont, Riverside County, California, surrounded by family, concluding a struggle that had weighed heavily on him in recent months.
Castillo, who competed professionally from 1975 to 1997, carved out an impressive legacy by taking on some of the most renowned champions the sport has ever seen. Over his 79 fights, he shared the ring with numerous Hall of Famers—an extraordinary roster of legends from boxing’s celebrated era.
The World Boxing Council confirmed Castillo’s death with a heartfelt tribute: “The WBC mourns the passing of four-time world title challenger Rubén Castillo, a true warrior who faced the very best: Julio César Chávez, Salvador Sánchez, and Alexis Argüello. The WBC family extends its deepest condolences to his family and loved ones.”
WBC President Mauricio Sulaiman shared his grief in a video message. “What a wonderful man,” Sulaiman said, describing Castillo as “such an unbelievable friend” who was always “nice, kind, always happy, always funny.”
The Conquistador burst onto the professional scene with an astonishing 43-0 winning streak that thrilled fans from the mid-1970s into the 1980s. His debut victory—a fourth-round knockout of Frank Castro in 1975—foreshadowed a career defined by boldness and impressive ring craft.
Standing 5’8″, Castillo fought across Featherweight, Super Featherweight, and Lightweight divisions, displaying both adaptability and toughness. His first loss came in January 1980 in a WBC super featherweight title bout against the legendary Alexis Argüello, who stopped him in the 11th round. Although it ended his unbeaten run, the fight cemented Castillo’s status among elite competitors.
Remarkably, the contest had been far tighter than the stoppage indicated. Argüello led by only one point on two cards, while Castillo was ahead on the third. Less than three months later, Castillo dropped back to featherweight to challenge WBC champion Salvador Sánchez, ultimately losing by unanimous decision after 15 grueling rounds, despite leading midway through the fight.
The 1980s represented Castillo’s peak, as he competed for world titles four times. Though he never captured a championship belt, his willingness to take on the sport’s most formidable opponents earned him deep admiration from fans and peers alike. His February 1983 match with Juan Laporte for the WBC featherweight crown was among several brutal clashes that defined his reputation. His final title shot came in April 1985 against the powerful Julio César Chávez, who stopped him in the sixth round.
Castillo also developed strong friendships with some of his former rivals, including Laporte, who became his closest companion. These relationships reflected Castillo’s generous spirit outside the ring, where he was cherished for his kindness. Laporte continued supporting the family through their later hardships.
Castillo retired and returned to boxing three different times, illustrating both his passion for the sport and how difficult it was for him to walk away. His 1989 return ended harshly when Edgar Castro knocked him out in the fifth round, resulting in hospitalization. His final appearance was in 1997, when Rudy Zavala defeated him by third-round knockout in Reseda, California, closing a distinguished 22-year career.
He ended his career with 67 wins, 10 losses, and 2 draws, including 37 knockouts—numbers that showcased both his punching power and his durability in one of the world’s most demanding sports. Fans admired him for his nonstop aggression rather than a cautious style.
Following retirement, Castillo transitioned into broadcasting. He worked as a commentator for Forum boxing shows in Inglewood during the 1980s, appearing with legendary sportscaster Chick Hearn on Prime Ticket broadcasts. Later, he became an analyst for ASPN, covering fights across the American Southwest and gaining a dedicated audience among both Hispanic and Anglo boxing fans. His deep knowledge and firsthand insight made him a respected figure in boxing media.
Castillo also took a brief step into acting, appearing in the 1988 film “Fists of Steel” alongside fellow fighters Alexis Argüello, Danny Lopez, and Armando Muñiz, though he chose not to pursue acting further.
Outside boxing, Castillo faced profound personal sorrow. His daughter Misty died on her 37th birthday, a heartbreaking loss for him and his family. He is survived by his wife Cindy and several children, including twins.
Funeral arrangements have not yet been shared, and the family is expected to hold private services for close friends and family.
Castillo’s death signals the end of an era for fans who remember the fierce fighters of the 1970s and 1980s—warriors like The Conquistador, whose courage, talent, and fearlessness helped shape the sport’s history.