Police say a woman was hit by a car and the driver took off in Coram.
The incident happened just before midnight at Route 112 near Middle Country Road.
Police say the unidentified woman was hit by a white car and then continued on Route 112 without stopping.
The woman was taken to Stony Brook University Hospital in serious condition.
Anyone with more information is asked to call Suffolk Crime Stoppers at 1-800-220-TIPS.