Police investigating the death of a pedestrian hit by a car are keen to trace a driver who may have seen the collision.
Martin Gray, 59, was taken to hospital following the collision involving a silver Mini Cooper on Tuesday January 16 on the A970 in Shetland.
He was originally treated in the Gilbert Bain Hospital in Lerwick before being airlifted to Aberdeen Royal Infirmary, where he died on Saturday January 20.
Officers are trying to trace the driver of a small hatchback car which was seen in the area at the time of the collision, although it was not involved in the incident.
The crash happened close to the junction with Gremista industrial estate near Lerwick.
Road Policing Constable Alasdair Mackay said: “Our thoughts remain very much with the family of Mr Gray while we continue with our investigation.
“We believe that the driver of a small dark coloured hatchback may have witnessed the collision but we have not yet traced this vehicle or the driver.
“We do not know the make, although it is of similar size to a Renault Clio or Volkswagen Polo. The car was heading north out of Lerwick towards Voe at the time.
“I would urge the driver or anybody who have information to come forward to help us establish the full circumstances around this tragic incident.”
Anyone with information is asked to contact the Road Policing Unit in Dingwall by calling 101 with any information, quoting reference NL178/18.