A man and a woman have been arrested by detectives investigating the murder of a man at his home in Co Down.
The 49-year-old man and 61-year-old woman were detained by officers from the PSNI's Serious Crime Branch on Wednesday night.
A police spokeswoman said they were being questioned about the circumstances surrounding Stephen Davidson's death at the weekend.
The 31-year-old was found dead at his house in Ballyholme, near Bangor, on Sunday evening.
The body of the unemployed man was discovered by a relative.
Detectives believe Mr Davidson may have known his killers and that he died as a result of a violent struggle.
A 40-year-old man and a 30-year-old man were arrested on Monday afternoon.