Baylor offensive lineman John Karkoska, who collapsed during football practice Sept. 13, died Saturday night.

Karkoska, 19, a redshirt freshman from Aldine High School in Houston, died just before the start of Baylor's 7 p.m. game with Sam Houston State University.Karkoska had been on a dialysis machine since Tuesday. Baylor doctors said Karkoska's heart-related illness was caused by an "underlying condition" such as a virus or infectious disease.