Montreal police are asking for the public's help to locate a vehicle wanted in a fatal hit and run Sunday afternoon in the Plateau-Mont-Royal borough.

A 79-year-old woman was crossing the intersection at St-Urbain Street and Mont-Royal Avenue around 12:50 p.m. when she was struck by a pickup truck. The driver fled the scene.

The woman was taken to hospital in critical condition and later died in hospital.

Police say witnesses described the four-door pickup truck as a white or silver Chevrolet Silverado, with a box on the back and damage to the driver's side of the vehicle.

The pickup truck also has a licence plate that is not from Quebec.

Anyone with information is asked to call 911.

The woman was struck by the vehicle in the afternoon. (CBC)

Police had established a large perimeter as their collision experts examine the area, but streets are now reopen to traffic.