Nate Diaz got involved in a fight in the audience at the Fight to Win Pro 77 grappling event in Sacramento, Calif., on Friday night. TMZ initially reported the news on Monday.
In a video of the incident, he is seen throwing a punch early on in the wild brawl. Diaz was not ejected from the event, according to TMZ.
The Fight To Win CEO addressed the incident over the weekend on Twitter.