York Regional Police are looking for a driver of a vehicle that struck a 61-year-old man in Markham on Wednesday night.
Police said the incident took place around 8:30 p.m., at the intersection of Yonge Street and Highland Park Boulevard, just north of Steeles avenue.
The pedestrian was struck while the vehicle was making a left-hand turn.
The male victim was taken to hospital with non-life-threatening injuries, but his condition later deteriorated to life-threatening.
Police are appealing for any witnesses or any dash cam video of the incident.
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The vehicle is described as a small, dark-coloured, newer model four-door vehicle.
Anyone with information is asked to call the Major Collision Investigation Unit at 1-866-876-5423 ext. 7704 or call Crime Stoppers anonymously at 1-800-222-TIPS