The incident happened in Amityville, near the intersection of Broadway and Loudon Avenue, at around 6:30 a.m. Wednesday, Oct. 30.
Suffolk County Police said the victim was walking his dog when they were struck by an Acura heading northbound on Broadway.
The victim, identified as 52-year-old Roy Mathes, of Amityville, was taken to Good Samaritan University Hospital in West Islip, where he was pronounced dead, police said. His dog died at the scene.
The driver of the Acura, a 47-year-old Amityville man, was not injured and remained at the scene.
Anyone with information in the case is asked to contact the Suffolk County Police Department at 631-854-8152.
Additional details about Mathes' life were not immediately available. His family is invited to contact Daily Voice with funeral details, a statement, or photos by emailing mmashburn@dailyvoice.com.
Click here to follow Daily Voice Glen Head-Sea Cliff and receive free news updates.