A Garden City man was arrested on Saturday morning for allegedly driving off after hitting and seriously injuring a motorcyclist, Nassau police said.

James Gallagher, 69, was trying to make a left turn east onto Old Country Road from Linden Street in his 2001 Nissan Pathfinder at 9:20 a.m. when he hit a motorcyclist who was traveling east in the right lane of Old Country Road, police said. Gallagher kept driving although the motorcyclist, 29, had been injured, police said.

The motorcyclist, who had internal injuries and a partial amputation of his right foot, was taken to a hospital, where he was listed in critical but stable condition, police said.

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A Garden City police officer found Gallagher driving on a nearby side street, police said.

Gallagher was arrested and charged with leaving the scene of a serious physical injury collision. He was ordered conditionally released to probation at his arraignment on Sunday at First District Court in Hempstead, and is due back in court on Dec. 6.