A 23-year-old woman has been arrested on suspicion of murder following the death of a man on Saturday, police said.
The victim, who has not been named, died in hospital after an incident in the Gowerton area of Swansea.
South Wales Police said officers were called to Sterry Road at around 1.25am to reports of an injured man in the road.
The man was taken to the city's Morriston Hospital where he later died.
A force spokesman said: "Next of kin has been informed. An incident room has been set up at Cockett police station and inquiries are ongoing.
"Witnesses or anyone with information are asked to contact South Wales Police on 101 or Crimestoppers anonymously on 0800 555 111."
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