I don't find a Facebook page or account, and no announcement seems to be published, but a search comes up with information others have posted, such as the two below:

From Hugh Jordan

Kevin Mitchell, the renowned Irish traditional singer, died in his adopted city of Glasgow, three days before Christmas. He recorded several albums, some with his talented Glasgow born wife Ellen. He emigrated to Glasgow in 1969. Kevin was born in St. Columb's Wells in Derry, but he was reared in Springtown Camp and later Creggan. As a young man, he regularly competed at Derry Feiseanna. An Irish speaker, Kevin had a vast repertoire of songs in both Gaelic and English, some of which he learned from Corney McDaid, a traditional singer from Meentahalla, Buncrana, Co. Donegal.

From Vincent Doherty

Just hearing today in messages from my old friends and fellow songsters George Duff and Francie Devine, of the passing of my good friend Kevin Mitchell at his home in Glasgow. He was the greatest singer that ever came out of Derry, and my main inspiration as a singer. I would never have been a traditional singer if I'd never heard Kevin sing. I still sing songs from his wonderful early 1970'S album "Free and Easy" which is a good description of both his singing style, and also his relationship with his beautiful wife Ellen. I had the privilege over the last few years of meeting and visiting Kevin and Ellen during regular trips to Glasgow and one memorable night in Edinburgh. Like myself Kevin was a Season Book holder at Celtic, a proud Derryman, a man after my own heart. My deepest sympathy to Ellen and the Mitchell family in Glasgow, Derry and beyond. A bright star has gone out, but his memory will never fade.