Nassau police are investigating a deadly hit-and-run in West Hempstead.

Authorities say the incident occurred around 3:40 a.m. According to detectives, a witness observed a man lying in the westbound lane of Woodfield Road. As the witness tried to render aid to the individual, a four-door sedan traveling westbound on the road struck the victim and did not stop. Woodfield Road is closed for the investigation.

The victim was pronounced dead at the scene by a Police Medic.

Authorities ask anyone with information to contact the Nassau County Crime Stoppers at 1-800-244-TIPS or call 911. All callers will remain anonymous.