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.
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