The man found dead inside a car on a layby of the A77 has been named by police as 46-year-old Michael Thomson.
Mr Thomson, from Ayr, was discovered by officers in a blue Ford Fiesta, with the registration LA56 HZN, parked near to Dalmilling Golf Course.
The car was found between Holmston and Whitletts roundabouts.
Police now say the car was driven there from an industrial unit on York Street between midnight and 1am.
Officers have now issued a fresh appeal for information following his death, which is currently being treated as unexplained.
The incident was reported to police at 6pm on July 25.
Detective Chief Inspector Alan McAlpine said: "Our enquiries have established the car may have been in the York Street area of Ayr from around 0800am on Friday 24th July. From our initial CCTV review, we now know it was driven to the layby from an industrial unit in York Street between midnight and 0100am on Saturday 25th July."
"We are grateful to everyone who has already made contact with police with information. We are continuing to work to establish the full circumstances and would urge anyone who may have seen Mr Thomson or this car at any time on Friday 24th and Saturday 25th July to contact us".
"Anyone who used the A77 between the Holmston and Whitletts roundabouts and may have dashcam footage is asked to review this and pass on anything which may be of note.
"Anyone who may have seen Mr Thomson, the vehicle or who has any other information can contact police on 101, quoting incident 3125 of 25 July."
