Durham Regional Police say a 36-year-old female cyclist has died after a collision in Oshawa on Friday morning.
Emergency crews were called to Stevenson Road South and Laval Drive at around 4 a.m.
Police said the woman was initially transported with critical injuries but died en route to the hospital.
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Investigators said the driver did not remain at the scene.
There is no suspect vehicle description as of Friday morning, however officers said there may be front-end damage as a headlight was found at the scene.
Stephenson Road South is closed between Gibb Street and Champlain Avenue as investigators gather evidence.