Egypt's state prosecutor Hisham Barakat was killed in a bomb blast that hit his motorcade on Monday.
The blast took place when the Barakat's convoy was passing through the military academy in Heliopolis, Al Ahram reported.
Barakat is said to have suffered injuries on his nose and shoulder, and suffered internal bleeding in his lungs and stomach, the site reported.
The public prosecutor was behind the arrest of the Muslim Brotherhood's leader Mohamed Badie after the military take-over in 2013, and had also frozen the assets of several of their members, according to Al Jazeera.
Only last month, three judges were killed in the restive Sinai peninsula of Egypt following the death sentence handed to former Egyptian president Mohamed Morsi.
Islamist militants have increasingly launched attacks on the country's judiciary following the harsh sentences handed out to hundreds of Muslim Brotherhood supporters.
— Sedky (@MrSedky) June 29, 2015