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A 61-year-old man has been arrested in Kent by detectives investigating the murder of a civil servant in Londonderry.
The suspect was arrested in the county on Wednesday, two other men, aged 27 and 28, were also detained in Derry on the same day.
The pair had been arrested last year and were released on police bail but were re-interviewed at Strand Road police station after a court approved their further detention.
A total of 17 people have been detained over Mr McCauley's death.
Catholic Paul McCauley spent almost a decade in a vegetative state after being beaten by loyalists in 2006.
He died in June last year.
The father-of-one was 29 when he attended a barbecue for a friend who was moving away from Northern Ireland.
A gang of up to 15 people emerged from nearby bushes and attacked him and two friends as they were clearing up after the meal in the early hours of the morning.
He suffered severe head injuries and died last year.
Mr McCauley's family has pursued a long campaign for justice.
24 year old Piper John McClements, previously known as Daryl Proctor, from the Fountain area of Derry, has been charged with the civil servant's murder.
The PSNI officer leading the investigation, Detective Chief Inspector Michael Harvey, said: ``We said after Paul died that this investigation would take on a renewed momentum and this momentum is continuing.
``One person has been charged with murder and another individual has been reported to the Public Prosecution Service. Detectives are available to speak with anyone who decides they want to talk to us.
``Even after almost 10 years, it is not too late to do the right thing and come forward. Anyone with information about the attack and its tragic outcome can speak to detectives on the non-emergency number 101.''