DONEGAL TOWNSHIP (KDKA) — Police are trying to figure out what happened to a man who was found unconscious on the side of a road in Butler County.

It appears he may have been the victim of a hit-and-run accident, but for right now, police say what happened to him is a mystery.

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Robert Stewart, 28, of Springville, Pa., was found in Donegal Township along Route 68 near Medical Center Drive.

Police say Stewart, a Marcellus Shale worker, was flown to a local hospital with multiple injuries.

He remains in critical condition with injuries to his arms and head. He is expected to survive.

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Police aren’t sure if he was walking along the road or if he was thrown from a car during the overnight hours. There were no witnesses at the scene.

Stewart was still unconscious early Thursday evening.

Police are waiting to talk with him when he wakes up.

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