Former 4X World Title Challenger Ruben Castillo Passes

By Boxing Bob Newman

Sad to report that former 4X world title challenger Ruben Castillo has passed. In late January 2026, reports indicated Castillo was facing significant health challenges. He had reportedly requested prayers for an upcoming medical procedure and urged others to prioritize regular checkups. He had previously battled Hodgkin’s Lymphoma.

He is survived by his wife, Cindy, and his extended family.

Born in Lubbock, Texas, and raised in Bakersfield, California...