Police investigating a fatal hit-and-run have released images of four key witnesses they want to trace.
Retired father-of-two John Ogston was found in Mains Road, Dundee, at about 11pm on New Year's Day with serious injuries to his head and body.
Four men helped carry the 67-year-old to his home nearby and he was taken to hospital but died the following day.
Police believe he was involved in a collision with a vehicle and sustained the injuries that caused his death. The vehicle involved has not yet been traced.
Officers believe the four men may be able to provide some information about the vehicle that hit Mr Ogston and urged them to come forward.
Police stressed the men in the CCTV images are not believed to be involved in any way but are key witnesses who stopped and helped Mr Ogston when he was injured.
A police spokesman said: "We appreciate that the images are not of the greatest quality but we hope that a member of this group may see these images and recognise themselves.
"It is possible that the males are Asian or eastern European.
"If this is you, or you think you know anyone who it could be, please contact us.
"There is nothing to fear and I would stress these men are witnesses.
"John's family are needing answers as to what happened to him and you may be able to provide us with the vital information that could help put their minds at rest."
Anyone with relevant information is asked to call 101 or speak to any police officer quoting incident reference CR/126/18.
Information can be given anonymously through Crimestoppers on 0800 555 111.
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