Published Tuesday, 12 June 2012
Police released a photograph of the missing man. (© PSNI)
Thomas McDonagh, from Victoria Street in the city, was last seen on 3 June.
He has been described as "vulnerable" and is on medication which he is not believed to be carrying with him.
Mr McDonagh is around 6'2'' tall and of medium to slim build, with brown eyes, pale complexion, short cropped black hair and may have a full grown dark beard.
When last seen he was wearing grey trousers, a brown jacket with a sheepskin collar, distressed tan shoes.
He also has a tattoo of a cross on his upper left arm and one of two hearts and a harp with Ireland written on it on his chest area.
Police have appealed for him to contact his family to let them know he is safe and well.
Anyone who knows of Mr McDonagh's whereabouts is asked to get in touch.