Gordon Stirling, 23, was left fighting for his life following the collision on the A77 on Monday 14 August.

Mr Stirling, from the Crosshouse area, died at the Queen Elizabeth University Hospital (QEUH) in Glasgow on Saturday.

The 42-year-old male driver of the white Ford Transit van is in a "serious but stable" condition at the QEUH, said Police Scotland.

Two passengers on the Stagecoach single decker bus, a 68-year-old woman and a 19-year-old man, were also taken to hospital as a precaution and were later discharged.

Fiona Doherty, managing director of Stagecoach West Scotland, said: "It is with great sadness that we confirm the passing of our colleague Gordon Stirling.

"The whole Stagecoach team is devastated about this and we all send our heartfelt condolences to his family and friends.

"We are also supporting those colleagues at Stagecoach who knew him."

Ms Doherty confirmed a full investigation into the incident is under way. She also thanked the emergency services for their response and the NHS team at the QEUH.

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The crash happened near the A719 junction that leads south to Galston.

Police said inquiries into the collision remain ongoing and anyone with information is urged to contact officers.

Inspector Craig Beaver said: "Our thoughts are with the family and friends of Mr Stirling at what is a very difficult time for them.

"Our investigation into the circumstances of the crash are continuing.

"I would ask anyone with information, including dashcam footage, who has not already spoken to officers to please get in touch."