Police Scotland said the 38-year-old was taken to hospital in Glasgow following the accident on Monday.
A quarter of all marriages in Scotland involve couples who don't live here but see it as the ultimate wedding destination.
A restricted zone for Dumfries and Galloway and parts of Ayrshire will be put in place on Thursday.
John Alexander Carruthers, 51, from the Annan area, died at the scene of the accident on the B721.
Police have appealed for witnesses to the crash which happened on the B721 between Annan and Gretna at about 09:45.
Caitlin Curry, 31, from Fife, was believed to have travelled to Dumfries and Galloway.
The former Greens Hotel in Gretna near the Scotland-England border is to become a business centre.
The scheme in the south of Scotland could meet the energy needs of about 30,000 homes.
The northbound carriageway from Carlisle to the Scotland border will shut from 20:00 BST next week.
