A pedestrian was seriously injured in Medford on Thursday when he was struck by a vehicle on Route 112, Suffolk police said.

Concetta Cullin, 48, of Kings Park, was driving a 2008 Dodge Charger northbound on Route 112 when she struck the pedestrian about a half-mile south of Commercial Boulevard at 5:52 p.m., police said.

The pedestrian, PL Jean-Baptiste, 30 of Hempstead, was transported by Medford Ambulance to Brookhaven Memorial Hospital Medical Center in East Patchogue where he was listed in serious condition.

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Cullin was not injured.

Witnesses are asked to contact the Sixth Squad detectives at 631-854-8652.