Hayek died in Freiburg, Germany, on March 23, 1992, less than two months shy of his ninety-third birthday. After 1985, he was unable to work and lost… - Alan O. Ebenstein

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Hayek died in Freiburg, Germany, on March 23, 1992, less than two months shy of his ninety-third birthday. After 1985, he was unable to work and lost contact with almost all friends and associates. In his last years, almost the only people with whom he had regular contact were his wife, Helene; secretary Charlotte Cubitt, whom he always called “Mrs. Cubitt”; children Larry and Christine Hayek; and Bartley. Hayek was grateful to Cubitt for her assistance from 1977 to 1992. He inscribed in her copy of The Fatal Conceit in 1990: “In gratitude for all her help over so many years F. A. Hayek.”
During his last years, he had periods of more and less lucidity, as well as being ill and depressed. Lord Harris of the Institute of Economic Affairs wrote in his obituary of Hayek that “by 1989 the great man had lost touch with affairs.” He was buried in Vienna, the place of his birth.
[...] Friedrich Hayek was the greatest political philosopher of liberty during the twentieth century.