An off-duty NYPD sergeant was viciously beaten in a Queens street attack early Sunday while his wife watched helplessly from their car, police and witnesses told the New York Daily News.

The fight outside St. John’s Express restaurant and bar on Liberty Ave. in Ozone Park left Sgt. Mohammed Deen, 40, in a medically induced coma Sunday night, cops said.

A graphic cell phone video appears to show Deen taking a brutal thumping from Hayden Holder, 29, who was charged with felony assault in the 5 a.m. attack.

“That n---- dead,” said the man filming the video, which shows Deen lying unconscious in the street as a man believed to be Holder punches him repeatedly and smacks his head on the pavement.

NYPD Chief of Department Philip Banks III said Deen got into a dispute with Holder outside the restaurant just before the bloody attack.