The crash happened just after 1 p.m. on Grand Street at the intersection of Lorimer Street in Williamsburg.
When police arrived at the scene, they found 85-year-old Rafael Nieves with serious injuries. He was taken to the hospital, where he was pronounced dead a short time later.
Witnesses told police the man was hit by a white box truck while crossing Grand Street. The truck fled the scene, but police tracked down the vehicle in Jersey City.
The driver told them he had no idea he had struck someone, and police said no charges will be filed at this time.