Police are the investigating the death of a 47-year-old man at Lottah, near Weldborough.
The man is believed to have suffered a single gunshot wound.
At 7pm on Saturday police were called to an address at Lottah where they found the man.
A 65-year-old man was taken into custody at the scene and is assisting police with their enquiries.
Investigations are continuing and it is likely charges will be laid, police say.