Nigeria's army chief Lt Gen Taoreed Lagbaja has died after a "period of illness" aged 56, President Bola Tinubu has announced.

He died on Tuesday night in Lagos. The exact details of his illness were not made public.

In a statement shared on X by presidential spokesperson Bayo Onanuga, President Tinubu expressed his "heartfelt condolences" to Gen Lagbaja’s family.

"President Tinubu wishes Lt General Lagbaja eternal peace and honours his significant contributions to the nation," the statement read.

His passing marked a significant loss for the Nigerian Armed Forces, where he "played pivotal roles in numerous internal security operations", it said.

The chief of army staff is the highest-ranking military officer in the Nigerian army.

Gen Lagbaja was appointed to the position in June 2023, not long after President Tinubu took office.

He was often away from duty - sometimes out of the country receiving treatment for an undisclosed illness - and had not been seen in public for some time, raising concerns.

During his short tenure, Nigeria saw an increase in attacks by fighters from the Islamist Boko Haram group and incidents of kidnapping, especially in the north and central parts of the country.

This includes the mass abduction of more than 280 children in Kuriga earlier this year.

Under former President Muhammadu Buhari's onslaught on the jihadist insurgency, he led a task force near Maiduguri, the northeastern city worst hit by the Boko Haram insurgency.

In the face of overwhelming security concerns, Gen Lagbja made it a point to ensure the army would not intervene in the country's democracy, especially after several neighbouring countries experienced military coups.

"We are agents of democracy and have no desire to truncate it," he said.

He also participated in a United Nations peacekeeping mission in the Democratic Republic of Congo in 2003.

Before joining the army, Gen Lagbaja attended a teachers' college in Osogbo. He went on to join the Nigerian Defence Academy in 1987, starting his military career.

He later obtained an MSc in Strategic Studies from the US Army War College in Pennsylvania.

Gen Lagbaja is survived by his wife, Mariya, and their two children.