Mr Conlon's family issued a statement through his lawyer Gareth Peirce.
This morning we lost our Gerry.
He brought life, love, intelligence, wit and strength to our family through its darkest hours.
He helped us to survive what we were not meant to survive.
We recognise that what he achieved by fighting for justice for us had a far, far greater importance - it forced the world's closed eyes to be opened to injustice; it forced unimaginable wickedness to be acknowledged; we believe it changed the course of history.
We thank him for his life and we thank all his many friends for their love.
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A frosty start to Sunday for many with slow-clearing mist and fog in the southeast.