"He has passed away," Justice Minister Ahmed al-Zind told the AFP news agency at the hospital where Barakat had been taken following the bombing on Monday.
Health Minister Adel Adawi told reporters outside al-Nozha hospital where Barakat was admitted that the cause of death was "ruptures in the lung and stomach, and internal bleeding".
Two civilians and two police officers were also reportedly injured in the attack, which took place in the Heliopolis district of Cairo, outside a military college.
Security sources said a bomb in a parked car was remotely detonated as Barakat's motorcade left his home.
Witnesses said the bombing was strong enough to shatter glasses in nearby storefronts and homes. A large plume of black smoke and several smouldering cars were seen near a row of apartment buildings.
No one has claimed responsibility for the attack. The now outlawed group Muslim Brotherhood has condemned the killing.
- aljazeera
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