York Regional Police say a 50-year-old cyclist has died after being hit by a car that did not remain at the scene.
Emergency crews were called to Carlton Road and Old Ivy Lane, just east of Main Street Unionville, at around 8:20 a.m. Monday.
Police said a man riding a bicycle was hit by a car and was taken to hospital in life-threatening condition.
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The cyclist died a short time later, police said.
Police said the driver who struck the cyclist left the scene before officers arrived.
Police have not yet released a description of the suspect vehicle.
Investigators are urgently appealing for any witnesses or anyone with photos or video, from 7:30 a.m. to 8:30 a.m. Monday, to come forward to police.