Dyfed Powys Police have confirmed that the driver of a black Peugeot involved in the collision on Wednesday 2 April has sadly died in hospital.
The late night collision took place around 10.50pm, where the driver of a second vehicle, a silver BMW, also sadly died.
The busy A4138, which connects Llanelli with the M4 at Hendy, was closed for around 10 hours while accident investigators were on the scene.
Police say they are continuing to investigate the collision and are appealing for anyone with information that could help their investigation to contact them.
A spokesperson for Dyfed Powys Police said: “Sadly, we can confirm that a second person has died following the collision on the A4183 between the Llangennech roundabout and the Crematorium roundabout on Wednesday, April 2.
“The driver of the black Peugeot, involved in the collision, died in hospital on Saturday, April 5.
“Our thoughts remain with the families at this difficult time.
“Officers are continuing to investigate the collision and anyone with information that could help the investigation is asked to contact police.”
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