Guilherme "Bomba" Vasconcelos -- an MMA fighter who competed in the UFC and Bellator, and dated Demi Lovato -- is dead at 38 years old, his family and members of the fighting community said on Tuesday.
The cause of death is not known at this time.
Vasconcelos made appearances across multiple MMA promotions ... and accumulated a record of 10-6 over the course of his seven-year pro career.
The MMA fighter posted a photo outside a Jiu-Jitsu studio to his Instagram less than 24 hours ago.