College Football Hall of Famer Gabriel Rivera died on Monday at the age of 57.
Per David Flores of KENS 5, Rivera died at a hospital in the San Antonio area after being diagnosed with a perforated bowel on Friday.
Rivera initially became ill on Friday while he was attending an event at a social services organization where he had been volunteering.
"Gabriel went home to the Lord at 9:25," Rivera's wife, Nancy, wrote in a text, per Flores.
She also noted doctors were unable to perform surgery because he didn't have a stomach muscle.
Rivera played college football as a defensive tackle at Texas Tech from 1979-82. He ended his collegiate career with 321 tackles, 34 tackles for loss and 14 sacks and was part of the 2012 College Football Hall of Fame class. Rivera was also inducted into Texas Tech's Ring of Honor in 2014.