In 2014, Nigeria faced a near-existential threat when Ebola was introduced to Lagos, a city of over 20 million people. Dr. Stella Ameyo Adadevoh (1956-2014), a physician at First Consultant Hospital, played a pivotal role in preventing the spread of the virus by making the crucial decision to quarantine the index case, Patrick Sawyer, despite intense governmental pressure to release him. This review explores Dr. Adadevoh's life, her heroic actions during the Ebola crisis, and the lasting impact of her work on Nigeria's public health system. It also highlights the ethical and professional challenges she faced, including balancing patient autonomy with the need for public safety. Through her brave decision-making, Dr. Adadevoh sacrificed herself to save countless lives and ensured Nigeria's swift containment of the deadly virus, leaving behind an inspirational legacy of medical ethics, leadership, and courage that continues to influence public health policy today. This paper highlights the lessons learned from her actions, emphasizing the critical role of decisive leadership in managing infectious disease outbreaks and the profound selflessness and courage she demonstrated.