Hosni Mubarak, who ruled Egypt for 30 years until he was overthrown by a revolution in the Arab Spring last year, was declared clinically dead by his doctors on Tuesday, the state news agency MENA said in a report confirmed by a hospital source.
Mubarak was 84 and had been sentenced to life in prison earlier this month.
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"Former president Hosni Mubarak has clinically died following his arrival at Maadi military hospital on Tuesday evening," MENA said, quoting medical sources.
"Mubarak's heart stopped beating and was subjected to a defibrillator several times but did not respond."
Two security sources denied the report. They told Reuters that Mubarak is unconscious and is on a respirator but is not clinically dead.
Egypt's state-run news agency said earlier Tuesday that the former president slipped into a coma after suffering both a cardiac incident and an stroke.
He was then from a prison hospital to the military facility.
State media said earlier that the ousted leader was in a "critical condition" and has been placed on a respirator. MENA reported that the prison authority has called in his doctors to treat his stroke in "a fast deterioration of his health" and that they were giving him medications to break up blood clots.
Mubarak was sentenced to a life in prison on June 2, for failing to stop the killing of protesters during last year's uprising against him.
He was transferred to prison after spending months in a military facility in detention. Officials have since repeatedly reported his health was deteriorating.
Since his arrival at the prison directly after his sentencing, Mubarak has been suffering from high blood pressure and breathing difficulties and deep depression, according to prison officials.
His lawyer said he didn't trust the doctors and appealed for his transfer to a better equipped hospital.
AP and Reuters contributed to this report
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