Police and the family of 29-year-old Stephen Martin are becoming increasingly concerned for his wellbeing.

Stephen was last seen in the Londonderry area approximately 3 weeks ago.

He is described as being 6’ tall, of slim build, with brown coloured shaven hair and facial stubble.

It is believed that Stephen has travelled to the Republic. His Audi car has been discovered parked at Fanad Lighthouse in Donegal.

The singer-songwriter, who performs under the name Rainy Boy Sleep, is a native of Lifford, Donegal.

Stephen played Glastonbury for three consecutive years, was nominated for Best Solo Act in the NI Music Awards in 2011 and toured with Cyndi Lauper and James Morrisson.

Police are appealing for Stephen, or anyone who knows of his whereabouts, to make contact with police or his family on 101.

@BelTel this is a more recent photo doing the rounds on Facebook. Please share &let's hope he's found safe. Thanks. pic.twitter.com/jofS8gpzly — ConorMcAteerMusic (@CMcAteerMusic) August 9, 2016

Belfast Telegraph