Emergency services were called to a flat on Robinson Street, Llanelli, over the concerns for the welfare of a man.
Liam Rees Morgan-Whittle was rushed to hospital but was later pronounced dead.
His family has issued a tribute to the loving son.
“As a family we are devastated by the loss of Liam,” the statement reads.
“He was a wonderful young man who will be sadly missed by all that knew him.
“We would ask for privacy at this sad time.”
Dyfed-Powys Police is treating his death as suspicious and has arrested a 38-year-old man in connection with the incident.
He has since been bailed pending further enquiries.
Police say that officers will be patrolling the area today conducting house to house enquiries.
Mr Morgan-Whittle’s family is being supported by specialist officers.
(Lead image: Dyfed Powys Police)
