A 31-year-old man today was killed in a chain-reaction collision caused by a driver who fled the Upper East Side scene, police said.

The victim, whose name has not been released, was a passenger in a Toyota Camry heading northbound on the FDR Drive early this morning when the horrific accident occurred near East 84th Street, police said.

A white SUV slammed into a car, which then struck a third and fourth vehicle at 2:07 a.m., police said. The driver of the White SUV then sped off.

The victim was pronounced dead at Metropolitan Hospital, police said. Cops are investigating.