Add Yahoo as a preferred source to see more of our stories on Google. Katie Donnell, 28, was a "workout queen" who died of a shocking heart attack -- her mother believes it was a caffeine overdose and ...

Katie Donnell, a 28-year-old teacher from Florida, was the epitome of health- followed a rigorous fitness routine, ate only organic foods, and had no diagnosed medical conditions. But in August 2021, ...