A 25-year-old man fatally plunged from the Manhattan Bridge while trying to run from the scene of a crash early Tuesday, authorities said. 

The man was involved in a two-car accident on the lower level of the span around 1:45 a.m., cops said. 

He ran off before police arrived — and either jumped or fell from an elevated section of the bridge with roadway below, police said.

A pedestrian found him on the ground, where he landed, at Henry and Forsyth streets on the Lower East Side, according to cops.

He was taken to NewYork-Presbyterian Lower Manhattan Hospital, where he was pronounced dead. 

He was not immediately identified.