Hauwa Mohammed Liman worked in a hospital supported by the International Committee of the Red Cross (ICRC) when she was abducted with Alice Loksha, a nurse who worked in a center supported by UNICEF last March.
According to Patricia Danzi, ICRC's regional director for Africa, "the news of Hauwa's death has broken our hearts".
"We are a humanitarian organisation so we can not enter into such kinds of negotiations".
"I pray to Allah for Alice and Leah's release". And that's what we did.
"We hereby, call on the Federal Government to expedite and prioritise the safe return of all civilians abducted by insurgents and emphasise that the government exhibit a greater sense of responsibility by ensuring the safety and security of citizens and fulfil its promise of ending the security challenges in the country". Her mother in recent weeks has said her life was in danger.
There was no immediate comment from the ICRC, which on Sunday said "we urge you for mercy" and noted that a 24-hour deadline was counting down.
"Saifura and Hauwa were killed because they are considered as Murtads (apostates) by the group because they were once Muslims that have abandoned their Islam, the moment they chose to work with the Red Cross, and for us, there is no difference between Red Cross and UNICEF", the group added.
The group murdered Khorsa last month, and released a video threatening to kill one of the other women by Monday if the government did not meet its demands, which have not been revealed.
Khorsa, also a midwife, was killed in September.
A schoolgirl who is also being held was among 110 girls kidnapped from a school in the town of Dapchi in February.
President Muhammadu Buhari said the government did everything to save Liman's life.
According to the President, Nigeria needs the ICRC and the government will continue to do all it can to protect staff of the organisation and other aid workers that are providing much-needed humanitarian services in the North East region, which had been affected by nearly a decade-long conflict.
The ICRC helps 80,000 mainly displaced people in the northeastern town of Rann.
The heart-breaking news of the death of Hauwa Leman comes as an extreme shock, which leaves us devastated by the deeply regrettable consequences of the Government's failure.