Police are appealing for information following the incident on Coleshill Terrace.
A man has been arrested on suspicion of manslaughter following the death of a man in Llanelli.
The 47 year old was found injured in the street on Coleshill Terrace in the early hours of Saturday morning.
He was taken to hospital where he later died.
DCI Anthony Evans, who is leading the investigation, said:
"I need to speak to anyone who saw or heard anything along Coleshill Terrace (on Saturday morning) between the hours of approximately 1am and 4am.
"I’d also like to hear from anyone in the street who has private CCTV attached to their property.
"A man was found injured in the street and was conveyed to hospital, where he died shortly after. If you have any information, please contact my team via 101, quoting reference number DP-20190629-072.
"Residents will notice a large police presence in the street – they are all there as part of the ongoing investigation, but I’d like to reassure anyone who is concerned, we are not looking for anyone else in connection with the incident at this time."