Today marks the 11th anniversary of the murder of 24-year-old Derry man Andrew Allen.
Andrew was murdered by a group of individuals in his home at Links View Park on February 9, 2012.
He was shot in front of his partner at approximately 9.20pm and later pronounced dead at the scene.
The murder has been blamed on republican vigilante group RAAD.
Investigating Gardaí believe that a number of people were involved in the murder, destruction of evidence and subsequently sheltering the killers involved.
A number of people have been arrested and questioned in connection with the investigation to date.
But Gardaí believe that there are still people in both Buncrana and Derry City who have information that may assist in bringing those responsible to justice.
An Garda Síochána is appealing to anyone with information, however insignificant it may seem, to come forward.
Anyone with information is asked to contact the incident room at Buncrana Garda Station on 074-93 20540, the Garda Confidential Line 1800 666 111 or any Garda Station.