Nikola Jokic Brother Punches Fan In Crowd ... NBA Investigating
update
8:20 AM PT -- TMZ Sports has learned ... the NBA is currently looking into the situation.
Nikola Jokic's brother was in no mood to celebrate the Nuggets' comeback win over the Lakers on Monday ... 'cause he straight-up punched a fan in the stands at the playoff game -- and it's all on video.
According to witnesses, the violent incident went down shortly after Joker and his Denver teammates completed their 101-99 win against LeBron James and co. to go up 2-0 in the first-round series.