A 57-year-old man arrested by officers investigating the murder of Michael Gerald Hampson has been released pending a report to the PPS.
News of the arrest was revealed by the PSNI earlier.
Mr Hampson - who was 53-years and from Londonderry - was reported missing on December 7, 2007.
His body was found on the shore of Lough Neagh near Toomebridge in Co Antrim a month later.
His family are reported to have made a complaint about the police investigation into the disappearance and death of Mr Hampson in January 2010.