The eastbound lanes of the Gardiner are open again after being closed for the majority of Wednesday evening.
Police say around 7pm, the driver of a pickup truck struck and killed a pedestrian near Park Lawn.
The driver fled the scene, but police believe there's visible damage to the right side of the vehicle.
Just exactly how the woman in her 20's ended up on the highway is still uncertain.
Police are asking the driver to contact police.