A former CNBC producer was killed when his e-cigarette exploded and lodged in his skull ... according to an autopsy.

Tallmadge Wakeman D'Elia died on Cinco de Mayo in St. Petersburg, FL after his vape pen ignited a fire in his bedroom. The autopsy results just came out and reportedly showed the e-cig not only exploded and sparked the blaze, but it also made a "projectile wound" in D'Elia's skull.

The 38 year old's vape pen was reportedly a device made in the Philippines that is unregulated and not recommended for beginners. It is still unclear what caused the pen to explode.