Russell Crowe, who played him, tweeted: "Stunned... My heart goes out to John & Alicia & family. An amazing partnership. Beautiful minds, beautiful hearts."
"The story of John Forbes Nash, who won the Nobel prize for economics in 1994, is unusual, if not astonishing. As a graduate student in 1949, Mr Nash undertook an analysis of competition that became one of the pillars of game theory. But more than 30 lost years lay between this honour and the time when the work it honoured was done. The brilliant mathematician of the 1940s and 1950s was destroyed by schizophrenia, and re-emerged only in old age, after an almost unprecedented recovery."
In 1998, The Economist reviewed Sylvia Nasar's masterful biography of John Nash, "A Beautiful Mind" http://econ.st/1JNNcEk