The PSNI are appealing to the public for assistance in finding 29-year-old Stephen Martin, aka, musician 'Rainy Boy Sleep'.
Police and the family of missing person, Stephen Martin, are becoming increasingly concerned for his wellbeing.
Stephen was last seen in the Derry/Londonderry area approximately three weeks ago.
He is described as being 6ft tall, of slim build, with brown coloured shaven hair and facial stubble.
It is believed that Stephen has travelled to the Republic of Ireland and his Audi car has been discovered parked at Fanad Lighthouse in Donegal.
Police are appealing for Stephen, or anyone who knows of his whereabouts, to make contact with police or his family on 101.