An East Texas 14-year-old has died after football practice at his school.
Kevin Wallace of Nacogdoches was running wind sprints when he collapsed. Attempts at CPR couldn't revive him.
Autopsy results now show he died of a heart arrythmia, possibly aggravated by exercise. His grandmother says Kevin was a dedicated athlete and did his best on the field.
Grandmother Linda Wallace: "Kevin was a fighter up to the end, to live, but she wants everyone to know he fought real hard."