The close ally of President Muhammadu Buhari died on Monday night shortly after driving himself to a hospital.
Funtua, who was a former Minister in the Second Republic, reportedly felt unease at about 4pm.
The Nation learnt he did not take things for granted and he drove himself to a hospital where he died.
A source said: “It is difficult to confirm what really happened but he lost the battle after getting to the hospital.
An in-law to Buhari, the deceased would be buried on Tuesday.
Until his death, he was one of the most influential politicians and businessmen in Nigeria.