(WTVJ) - When Richard Perez was 41 years old, and very physically fit, he had a heart attack.

"No lie, I saw this white light and I was like ..." he said, shaking his head

Perez said that two times a day, for about five years, he gulped down the energy boost known as 5-Hour Energy.

The Food and Drug Administration is now investigating 13 deaths possibly linked to so-called "energy shots."

WTVJ