Three men were arrested tonight by police investigating the murder of a sheep farmer in the North four years ago.
A 60-year-old man, a 30-year-old and a 26-year-old were being questioned in connection with the murder of Patrick Devine.
The 26-year-old was also quizzed about alleged membership of the the INLA.
Mr Devine was found slumped over his dinner at his remote farmhouse outside Claudy in the Sperrin Mountains in Co Derry.
He had been shot several times at close range.
As well as running the large-scale mountain sheep farm on which he lived alone, he worked as a psychiatric nurse in Derry.
The PSNI said the three suspects were detained at various locations in the Claudy area by detectives from the Serious Crime Branch.
They are being interviewed at the Serious Crime Suite in Antrim.
The killing in September 2004 was featured on the BBC Crimewatch programme in June this year.
In September, a 52-year-old man was charged with making threats to kill, possession of ammunition in suspicious circumstances and intimidation in relation to the killing.