A family source said the late Plateau Central Senator died at a private hospital in Abuja after nine days of sickness and isolation.
He informed Mantu died around 2am on Tuesday.
“He fell ill about nine days ago and was receiving treatment at home but he was rushed to the hospital when there was no sign of improvement,” the source said.
The source added the funeral prayer would hold today in Abuja.
Mantu, in 2001, was elected Deputy Senate President on the platform of the People’s Democratic Party (PDP), a position he held till 2007 when he did not return to the Senate.
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He hailed from Gindiri District in Mangu Local Government Area of Plateau and worked in various establishments before joining politics.
Plateau Governor Simon Lalong described his death as a great loss to the State.
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He said: “Late Senator Nasiru Mantu was a grassroots politician whose life was all about the interest of the people as he did everything within his power to serve them through empowerment and quality representation
“He earned his place in Nigerian politics by active involvements and also had a great connection with the youth whom he mentored not only in politics but in other fields, especially service to humanity”.