According to The Cable, citing a source, Obuah died at the National Hospital, Abuja, after suffering a "massive heart attack".
It is believed that Obuah's ordeal in detention facilitated his death.
The ex-CSO was arrested by the Department of State Services (DSS) shortly after Jonathan left office for allegedly benefiting from an oil bunkering deal.
While in detention at the DSS headquarters, he embarked on hunger strike.
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Obuah was later released after his lawyer cried out over his client's health condition.
He was also dismissed from the DSS after the panel which investigated him said it was not satisfied with his explanation on the oil bunkering deal and therefore recommended him for dismissal.