An argument between an 80-year-old woman and a driver resulted in a fatal hit-and-run Sunday night in West Islip, police say.

The incident happened on Tanglewood Road around 9:30 p.m.

Police say the Helga McNulty exited the vehicle after the argument. Investigators say the driver then backed up and slammed into her and fled the scene, destroying a fence in the process.

McNulty was taken to Good Samaritan Hospital with extensive injuries. She was later pronounced dead.

Police say they have the vehicle that was involved in the crash, and they know the driver’s identity.

Police said the woman and the driver knew each other but did not elaborate. No arrests have been announced.

"It's very disturbing that it happened," said the victim's neighbor Davorka Linich. "I mean this is the most safe and quiet neighborhood."