Karbownik was pronounced dead at the scene.
The vehicle, a 2007 Chevy Trailblazer, that struck her left the scene. However, a piece of the bumper was left behind.
The vehicle was later located on North Pine Street in North Patchogue and was impounded, but are still looking for the driver.
Montauk Highway was closed for hours for the police investigation.
The investigation is continuing. Detectives are asking anyone with information to call the Seventh Squad at 631-852-8752 or anonymously to Crime Stoppers at 1-800-220-TIPS. All calls will be kept confidential.