The driver left the scene, police said. Karbownik was pronounced dead at the scene.
The road was closed in both directions for the investigation until about 6 a.m., police said.
Seventh Precinct detectives said they later located the car they believe hit Karbownik, who was walking with a friend. The friend was not hurt.
Police declined to provide details about the vehicle as the search for the driver continues. No arrests have been made.