Detectives from the Police Service of Northern Ireland's Major Investigation Team are making a renewed appeal for information on the fourth anniversary of Glenn Quinn's murder.
The appeal is backed by an increased reward of up to £40,000 for information leading to the arrest and conviction of those responsible. There is already a £20,000 Crimestoppers reward and in addition a further £20,000 has been offered by a donor who wishes to remain anonymous.
Information can be passed to the charity Crimestoppers with complete anonymity. Phone 0800 555111 or visit the Crimestoppers website.