Katie Donnell’s mother is speaking out about the dangers of energy drinks, calling them “harmful and deadly” in the wake of her 28-year-old daughter’s death.

Katie Donnell, 28, was a "workout queen" who died of a shocking heart attack — her mother believes it was a caffeine overdose and that energy drinks are to blame.

Katie Donnell, a teacher from Florida, would drink up to three energy drinks a day, along with coffee — and would take a caffeine supplement before hitting the gym, her mother, Lori Barranon ...

Katie Donnell, 28, was committed to a healthy lifestyle but often drank three energy drinks a day, and “was drinking a lot of coffee,” according to her mother. A fitness and caffeine ...

Katie Donnell, 28, was committed to a healthy lifestyle but often drank three energy drinks a day, and “was drinking a lot of coffee,” according to her mother. advertisement.