It happened on Friday, Oct. 16 at about 7:25 p.m. in East Patchogue.
Officers responded to Americus Avenue just south of Atlantic Avenue after a 911 caller reported a body in the roadway, Suffolk County Police said.
Upon arrival, it was determined that the man was struck by a vehicle.
Detectives determined the bicyclist, Santos Rivera, 40, of East Patchogue, was traveling northbound on Americus Avenue when he was struck by a northbound vehicle that fled the scene, according to police.
Rivera was pronounced dead at the scene by a physician assistant from the Office of the Suffolk County Medical Examiner.
Detectives believe the vehicle that struck Rivera is a dark-colored SUV with front-end damage and fled westbound on Atlantic Avenue.
Detectives are asking anyone with information to call the Major Case Unit at 631-852-6555 or Crime Stoppers at 1-800-220-TIPS. All calls will remain confidential.
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