India, March 26 -- A fitness and caffeine enthusiast, 28, reportedly died from a heart attack. Katie Donnell's grieving mother now believes energy drinks are responsible for her daughter's death.

Donnell was committed to a healthy lifestyle. However, she often drank three energy drinks a day. She took a caffeine supplement before hitting the gym.

"At 28, you just don't see people dropping dead of a heart attack," Donnell's mother, Lori Barranon, recently told Kennedy News & Media. "She was a workout queen, she ate real clean, she ate organic food, she was the epitome of health other than [having energy drinks]."

Donnell was a Florida teacher. Her mother said that Donnell may have believed that the energy drinks and caffeine would give ...