Gordon Stirling, 23, died in hospital five days after the collision between his Stagecoach single-decker bus and a white Ford Transit van on the A77 on Monday 14 August.
The 42-year-old male driver of the van was taken to hospital with serious injuries.
The collision happened near the A719 junction between Fenwick and Kingswell that leads south to Galston.said the force is now treating Mr Stirling's death as a murder investigation. No arrests have been made. Detective Chief Inspector Jennifer McCulloch said:"Our enquiries into this incident are ongoing to establish the full circumstances.
"Our thoughts remain with the family of Gordon Stirling and we are providing them with support as the investigation progresses."
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