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General Sani Abacha, Nigeria's military ruler from 1993 until his death in 1998, passed away on June 8, 1998. The exact cause of death remains uncertain, with sources attributing it to a sudden heart attack or possible poisoning. His tenure was marked by authoritarian rule, widespread human rights abuses, and allegations of corruption. Abacha's death paved the way for a transition to civilian rule in Nigeria.