It happened around 12:45 a.m. Sunday, Aug. 20 in Port Jefferson Station.
The victim was driving a 2012 Hyundai Genesis southbound on Route 112, near Washington Avenue, when he lost control of the vehicle, which struck a telephone pole and a fire hydrant, and then crashed into a tree, Suffolk County Police said.
The victim, identified as Christopher W. McGuckin, age 54, of Shoreham, was pronounced dead at the scene by a physician assistant from the Office of the Suffolk County Medical Examiner.
Detectives are asking anyone with information on the crash to call the Sixth Squad at 631-854-8652.
Click here to follow Daily Voice Brentwood and receive free news updates.