The incident happened on Thursday, Dec. 17 at approximately 12:30 a.m. in Bellport.
Lloyd Richards, 26, of Bellport, was driving a 2009 Honda Civic eastbound on Brookhaven Avenue, 50 feet east of Station Road, when the vehicle struck the pedestrian in the roadway, Suffolk County Police said.
The victim, a 48-year-old woman, was pronounced dead at the scene by a physician assistant from the Office of the Suffolk County Medical Examiner.
Her identity is being withheld pending notification of next of kin.
Richards was not injured.
The Honda was impounded for a safety check. Detectives are asking anyone with information on this crash to call the Major Case Unit at 631-852-6555.
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