Lagbaja died after battling an undisclosed ailment.
He was 56 years of age.
He was appointed COAS by President Bola Tinubu on June 19, 2023.
On October 20, the army dismissed rumours that Lagbaja had passed on, adding that the army chief was undergoing medical treatment abroad.
On October 30, Tinubu appointed Olufemi Oluyede as the acting COAS.
On November 5, the president decorated Oluyede with a new rank of lieutenant-general.
In a statement on November 6, Bayo Onanuga, special adviser on information and strategy to the president, said Lagbaja “passed away on Tuesday night in Lagos after a period of illness”.
“Born on February 28, 1968, Lt. General Lagbaja was appointed Chief of Army Staff on June 19, 2023, by President Tinubu,” the statement reads.
“His distinguished military career began when he enrolled in the Nigerian Defence Academy in 1987.
“On September 19, 1992, he was commissioned as a Second Lieutenant in the Nigerian Infantry Corps as a member of the 39th Regular Course.