'Black Ink Crew: Chicago' Star Junior Diaz Accused of Sucker Punch at Party

‘Black Ink Crew: Chicago’ Star

Alleged Sucker Punch ‘On Set’

… Cops Called

12/8/2018 12:10 AM PST

EXCLUSIVE

A party for VH1’s “Black Ink Crew: Chicago” turned violent when one of the stars got into a fight with a guest … well, it wasn’t much of a fight.

Law enforcement sources tell TMZ … Junior Diaz got into a heated convo with someone during the party in Chicago. During the argument, we’re told Junior called the other guy a bitch … then immediately sucker punched him in the face. In the face!!!

When cops showed up at the Dec. 1 bash … they found the punchee disoriented and bleeding from the mouth. He was transported to a hospital where he got stitched up. 

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Our sources say the party was being shot for ‘Black Ink’ … although it’s unclear if cameras captured any of the fight. Remember, it didn’t last that long. Two hits: Junior’s punch, then the guy hitting the ground.  

We’re told Junior had bounced when cops arrived, and witnesses weren’t down to talk. 

We’ve reached out to VH1 … so far, no word back.