Chicago-based boxer Francisco Rodriguez died Sunday night in Philadelphia, two days after his bout with Teon Kennedy at the Blue Horizon.
After being stopped by a technical knockout in the 10th round, Rodriguez, 25, collapsed and was rushed to Hahnemann University Hospital, where he underwent emergency brain surgery.
Born in Guadalajara, Jalisco, Mexico, Rodriguez was a successful amateur boxer in Chicago and turned pro in 2005.
Rodriguez was 14-2 going into the bout against Kennedy for the vacant USBA super bantamweight title. Rodriguez was a national Golden Gloves champion in 2001.
"It's with a very heavy heart that we make this announcement," promoter Dominic Pesoli of Chicago-based 8 Count Productions said in a released statement. "Francisco was family to us and we all loved him very much.
"He was very popular with fight fans in Chicago and will be deeply missed."
Pesoli said a fund is being set up for Rodriguez's wife and infant daughter.
Information from The Associated Press was used in this report.