Suffolk police detectives are investigating a hit-and-run crash Tuesday morning in Mastic Beach that left a pedestrian critically injured.

The accident occurred about 9:40 a.m. on Mastic Beach Road, 100 feet north of Longfellow Drive, police said.

Seventh Precinct officers responded to the scene at 9:40 a.m. "after a 911 caller reported that a pedestrian was lying in a wooded area on the side of the road," police said in a news release.

Officers arrived to find the victim, Michael Walstrum, 37, of Mastic Beach, had been struck by a vehicle.

Mastic Beach Ambulance Company transported Walstrum to Brookhaven Memorial Hospital Medical Center in East Patchogue. He was listed in critical condition.

The vehicle "is believed to be metallic blue with front-end damage and front passenger side body damage," police said, and it is also believed to have fled south on Mastic Beach Road.

Detectives urge anyone with information about the crash to call the Vehicular Crime Unit at 631-852-6555 or anonymously call Crime Stoppers at 800-220-TIPS.

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