The disgraced President's heart stopped beating on Tuesday (19Jun12), and officials at Egypt's state-run news agency MENA report the 84 year old is not responding to a defibrillator.
Mubarak has been severely ill since before he was sentenced to life imprisonment for failing to stop the killing of protesters during the uprising which overthrew him in 2011.
He began his sentence at the beginning of the month (Jun12).
A MENA report reads: "Former president Hosni Mubarak has clinically died following his arrival at Maadi military hospital on Tuesday evening. Mubarak's heart stopped beating and was subjected to a defibrillator several times but did not respond."