Disturbing video shows the moment shots rang out inside a Brooklyn catering hall, fatally striking a man believed to be a gang member in the head early Saturday.

The video shows people dancing and celebrating as music blares and lasers flash inside the K&L Manor on Glenwood Road near East 45th Street in East Flatbush, before three gunshots rang out around 4:20 a.m. Saturday.

Another video shows the victim lying on the tile floor as an NYPD officer performs CPR on him.

The 29-year-old man, whose name wasn’t immediately released, was pronounced dead at Brookdale Hospital.

Police sources said he was a Bloods gang member.

Police did not have a description of the suspect or motive, but the victim is “known to the department,” an NYPD spokesman said.

Other videos of the mayhem that followed the gunfire show a rescue worker performing CPR on the man and woman screaming.