Leandro Lo, one of the most accomplished competitors in Brazilian jujitsu, was shot in Brazil.
Clube Srio is a sport and social club in the Sade neighborhood of So Paulo. 33-year-old Lo was out with pals at the club.
Henrique Otávio Oliveira Velozo, an off-duty military police officer, reportedly approached Lo, according to a police complaint viewed by local media.
According to the police report, witnesses indicated that Mr. Velozo snatched a bottle from Lo's table and made threatening gestures with it, resulting in a physical conflict between the two parties.
Mr. Velozo allegedly drew a revolver after they were separated and shot Lo in the head.
According to the attorney for the martial artist's family, Lo was brought to the hospital, where he was confirmed brain dead.
There have been no more updates regarding his status.
According to local news sources, a manhunt was underway for the culprit in an attempted murder probe.
A black belt under Cicero Costha, Lo was one of the most successful jujitsu competitors of all time, winning eight International Brazilian Jiu-Jitsu Federation (IBJJF) World Championships in 2012 as a black belt.
His passing sent shockwaves throughout the combat sports community.
In the hours after the news surfaced, other MMA celebrities paid respect to Lo via social media.
Kenny Florian, a former UFC fighter and PFL analyst, stated it was "a very sad day for the BJJ community."
Earlier this year in California, Lo earned the light heavyweight gold medal.
The 33-year-old won the World Cup, the Pan American titles, and the Brazilian National Jiu-Jitsu Championships.