The incident happened at around 7:20 p.m. on Friday, at the Port Jefferson dock on West Broadway.
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Officials say Plainview resident Stuart Dorfman suffered a medical emergency, causing him to lose control of his car and drive into the nearby water.
The 74-year-old was pulled from the water and pronounced dead at the scene, police said.
Detectives are asking anyone with information about this incident to call the Homicide Squad at 631-852-6392.
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