Police have confirmed that the man injured following the crash on the Westhill to Blackburn road at around 3.35pm on Wednesday has died in hospital.
He was Gerard Kelly, aged 62 years, from the Montrose area. His family are aware.
Witnesses to the incident who haven’t yet been spoken to by police are urged to get in touch on 101.
Inspector Jon Barron of the Divisional Road Policing Unit said: “At this very sad time, my thoughts are very much with Mr Kelly’s family, friends and colleagues. A number of motorists stopped at the scene to render assistance and administer first aid. I would like to thank them for doing their utmost to help.”