South Wales Police has confirmed the sudden death of a man at a property on West Walk in Barry.
Officers attended the property at around 1am today and are still in attendance whilst investigations are ongoing.
The force has said it is treating the incident as murder.
A 53-year-old man has been arrested on suspicion of murder and an incident room has been set up at Cardiff Central Police Station.
Senior Investigating Officer Detective Superintendent Darren George said:
"I can confirm a murder investigation has commenced following the discovery of the body of a local man during the early hours of this morning at West Walk in Barry. There will be a considerable police presence in the area over the coming days as the investigation continues.
"The victim has yet to be formally identified.
"This a direct appeal to the local community who may be able offer information in relation to any suspicious activity in and around the West Walk area of Barry, particularly between the evening of Monday August 30th and the early of hours of this morning (Friday September 3rd), no matter how insignificant you believe any information may be, please contact the major incident room."
Anyone who has any information in relation to the incident can contact the Major Crime Team directly via this public portal https://mipp.police.uk/operation/62SWP21B39-PO1 quoting reference number 2100309626 or by calling 101.