The incident was reported in the sound at the Oyster Bay Marina just before 3 p.m.
The driver of the 2011 Volkswagen Jeta was traveling through the parking lot at 5 Bay Avenue when he apparently struck the fence.
He became trapped when the car went into the water. First responders removed him from the water and took him to a hospital in critical condition.
The man was later pronounced dead at the hospital.
The car could be seen from NewsCopter 7 flipped over in the water.
Police will continue investigate the incident.
ALSO READ | Hochul calls for workers to return to NYC offices in the New Year
* More Long Island news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a News Tip