Dyfed-Powys Police is appealing for witnesses to a one vehicle road traffic collision that happened around 10.35pm on Saturday (January the 5th).
The collision involved a red Honda quad bike along an unclassified road just outside the village of Cilycwm towards Rhandirmwyn.
The rider, a 38-year-old local man sustained serious injuries and was conveyed to Heath Hospital in Cardiff. He sadly died in hospital on Sunday, January the 6th.
If anyone has information on this incident please contact Carmarthenshire Roads Policing Unit on 101 quoting reference 294 of January 6.