The demise of the tennis champion, broadcaster, and diplomat was announced by her family in a statement.
According to the statement, Segun, a retired administrator, died in the early hours of Thursday.
The statement added that her funeral arrangements will be announced later by the family.
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The novelist left behind a legacy of remarkable achievements and contributions to Nigerian society.
Born on February 18, 1930, Segun was a true pioneer, breaking barriers throughout her illustrious career.
Segun attend university in Nigeria, graduating from the University College Ibadan, now University of Ibadan, in 1953 with a degree in English Literature, Latin, and History.
This achievement marked the beginning of a distinguished academic and professional career that would take her to various parts of the country and beyond.