in 1982, President Ahmadou Ahidjo of Cameroon was persuaded by a team of doctors in France, at least that was the informed gossip, that his health was so bad he was not likely to make it to the end of the year. Ahidjo stepped down and handed over power to his prime minister and preferred successor, Paul Biya.
Two years later, Ahidjo found himself still alive, indeed, in good health and being ignored by Mr Biya.
He then tried to stage a coup d'etat; it failed and he ended up in lonely exile in Senegal where he died almost 20 years later.
http://www.bbc.co.uk/news/world-africa-11992163
