4:57 PM PT -- Jack's DJ surrendered to police and he's in custody at the Louisville Department of Corrections ... according to law enforcement.
Jack Harlow's DJ has just been indicted on a murder charge for his alleged role in a nightclub shooting in Louisville.
Prosecutors in Kentucky charged Ronnie Tyshon O'Bannon -- who goes by Ronnie Luciano -- with murder and tampering with physical evidence in connection with the fatal shooting ... and there's reportedly a warrant out for his arrest.
TMZ broke the story ... video shows the moment shots were fired inside Vibes Restaurant and Ultra Lounge, where Jack was partying with his DJ.
The footage appears to show an altercation between a woman and at least one man, who lean into each other before falling over in a scuffle. At that moment, you hear what sounds like a gunshot, and everyone in the club makes a run for it, including Jack.
Cops say a 37-year-old woman was found dead from the shooting, and a man was transported to a hospital with non-life-threatening injuries.