Police attended an address in Holly View, Triangle around 11pm on Sunday, following a concern for safety.
Inside the property officers found the body of a man in his 60's.
A post mortem examination has been carried out and the death is being treated as suspicious at this time.
A 28-year-old man was arrested on suspicion of murder, and remains in custody.
Anyone who has any information is asked to contact police via 101.
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