Detectives from Serious Crime Branch investigating the murder of Paul McCauley in Derry in 2006 have arrested a 61 year old man in England.
Two other men, aged 27 and 28, who were detained yesterday in Derry remain in custody.
The latest man to be arrested was detained in Kent yesterday and brought to Northern Ireland for questioning. He is being interviewed at Musgrave police station in Belfast.
Paul Mc Cauley, who was 38, died in June of last year in a care facility, almost nine years after an attack in July 2006. He was attending a summer BBQ at the rear of a house in Chapel Road on 15 July 2006. At 3.20am on 16 July, only three people remained at the BBQ. A number of individuals came out from the bushes and attacked Paul and two of his friends. After the assault the group made off in the direction of Irish Street.
The officer leading the investigation, Detective Chief Inspector Michael Harvey says the PSNI promised after Paul died that this investigation would take on a renewed momentum and that momentum is continuing. One person has been charged with murder and another individual has been reported to the public prosecution service.