A road-rage maniac beat a man to death with a baseball bat on the Belt Parkway in Queens early Sunday, according to authorities and sources.

Cops discovered Crisanie Dockery, 47, unconscious with severe head trauma and a 39-year-old man with minor injuries to his arm while responding to a report of an assault in progress on the eastbound parkway around 1:10 a.m., according to the NYPD.

Dockery of Springfield Gardens in Queens was struck with the bat in a confrontation over a car accident near Exit 21B at Farmer’s Boulevard, sources said.

He was taken to Jamaica Hospital, where he was pronounced dead. The 39-year-old was treated on the scene, police added.

The suspect drove away after the beatdown and remained on the lam as of Sunday evening, sources and authorities added.

Photos captured a crowd of people and officers swarming around a white Audi cordoned off by crime-scene tape in the darkness.

An investigation remains ongoing.