For the last four decades of her life, Slessor suffered intermittent fevers from the malaria she contracted during her first station to Calabar.
However, she downplayed the personal costs, and never gave up her mission work to return permanently to Scotland.
The fevers eventually weakened Slessor to the point she could no longer walk long distances in the rainforest, but had to be pushed along in a hand-cart.
In early January 1915, while at her remote station near Use Ikot Oku, she suffered a particularly severe fever.
Slessor died on 13 January 1915.

Her body was transported down the Cross River to Duke Town for the colonial equivalent of a state funeral.
A Union Jack covered her coffin.
 Attendees included the provincial commissioner, along with other senior British officials in full uniform.
Flags at government buildings were flown at half mast.
Nigeria's Governor-General, Sir Frederick Lugard, telegraphed his "deepest regrets" from Lagos and published a warm eulogy in the government gazette.

A report on her death in The Southern Reporter of 21 January 1915 mentions a time she spent on furlough in Bowden, Roxburghshire, Scottish Borders.
It states that "She and her four adopted African children were a centre of great attraction and helped to deepen the interest of the whole community in the Foreign Mission work of the Church."
It praises her strong force character, her unostentatious manner, and her zeal for the tribes around Calabar.
For the last four decades of her life, Slessor suffered intermittent fevers from the malaria she contracted during her first station to Calabar. However, she downplayed the personal costs, and never gave up her mission work to return permanently to Scotland. The fevers eventually weakened Slessor to the point she could no longer walk long distances in the rainforest, but had to be pushed along in a hand-cart. In early January 1915, while at her remote station near Use Ikot Oku, she suffered a particularly severe fever. Slessor died on 13 January 1915.
Her body was transported down the Cross River to Duke Town for the colonial equivalent of a state funeral. A Union Jack covered her coffin.  Attendees included the provincial commissioner, along with other senior British officials in full uniform. Flags at government buildings were flown at half mast. Nigeria's Governor-General, Sir Frederick Lugard, telegraphed his "deepest regrets" from Lagos and published a warm eulogy in the government gazette.
A report on her death in The Southern Reporter of 21 January 1915 mentions a time she spent on furlough in Bowden, Roxburghshire, Scottish Borders. It states that "She and her four adopted African children were a centre of great attraction and helped to deepen the interest of the whole community in the Foreign Mission work of the Church." It praises her strong force character, her unostentatious manner, and her zeal for the tribes around Calabar.
Mary Slessor