Detectives investigating the murder of Paul McCauley in Londonderry in 2006 have arrested a 25-year-old man in the city.
He has been taken to Strand Road police station for questioning.
Detective Chief Inspector Michael Harvey said today’s arrest brought the number of people who have been arrested since Paul died last June to 12.
To date, one man has been charged with murder and another reported to the Public Prosecution Service.
DCI Harvey said police inquiries into Mr McCauley’s murder were active and ongoing and he appealed to those with information to come forward.