The collision involved a silver BMW and a black Peugeot 208.
Sadly, the driver of the BMW died as a result of their injuries. Their next of kin has been informed.
The driver of the Peugeot remains in hospital in a critical condition.
The road was closed for collision investigation and was reopened by 8.45am today (April 3)
Anyone who may have been travelling along the A4138 at the time, is asked to contact police, either online at: https://bit.ly/DPPContactOnline, by emailing 101@dyfed-powys.police.uk, or by calling 101.
Investigating officers would particularly like to speak to any motorists who were in the area at that time who have dash cam in their vehicles.
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