Jonathan Cairns: Man released over Ballykelly murder
Detectives investigating the murder of Jonathan Cairns in County Londonderry on 25 April 1999 arrested a 50-year-old-man on Tuesday.
The 18-year-old was attacked in Ballykelly on his way home from a night out.
His body was found in a shallow grave in Loughermore Forest, about five miles from his home, the following day.
The 50-year-old was released on bail later on Tuesday. No-one has been convicted of the teenager's murder.
Meanwhile, police have said a file is being prepared for submission to the Public Prosecution Service (PPS) in relation to the offences of perverting the course of justice and withholding information in respect of a 44-year-old woman.
She was arrested on 19 November 2019 and then subsequently released on bail on 20 November.
In April 2019, Jonathan Cairns' parents made an appeal for information on the 20th anniversary of his murder.