A cyclist has died after being found lying on a road with a head injury.
The incident is believed to have taken place between 7.30pm and 7.45pm on Monday on the A917 between Elie and St Monans in Fife.
Scott Walker, from St Monans, was found lying on the road with serious injuries by members of the public, who then contacted police.
The 43-year-old was taken to Ninewells Hospital, where he died on Tuesday.
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One line of inquiry being followed by officers is that Mr Walker was involved in a collision with a vehicle, which then failed to stop.
Detective Chief Inspector John Anderson from Fife CID said: "Our condolences and sympathies are with the family of Scott Walker and we are continuing to provide them with all the relevant support they require, while also conducting a thorough investigation to establish exactly how Scott came by his injuries.
"If indeed, another vehicle has been involved, then the driver needs to contact us as a matter of urgency and help us provide Scott's loved ones with the answers they require."
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Inquiries suggest a Vauxhall Astra - believed to be silver or partly silver - was involved in a collision at the scene.
It could either be a hatchback, estate or Astra van.
Officers do not know at this time if it is linked to the fatality.
CCTV shows a number of vehicles were on the road travelling in both directions between St Monans and Elie between 7.30pm and 7.45pm on Monday.
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Police Scotland want to identify them vehicles and have asked any motorists or members of the public who were on or around the A917 on Monday evening to get in touch.
Mr Anderson added: "I would appeal directly to the driver of any vehicle involved in this incident to come forward so that they can provide an explanation to us about what happened."
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