Unidentified suspects shot dead Mohamed Mahmoud, son of a Cairo court appeal judge Mahmoud El-Sayed, in front of his house in Daqahliya governorate on Wednesday, Al-Ahram's Arabic news website reported.
According to eye witnesses, the suspects escaped as soon as they shot the young man in his back.
Security forces and ambulances arrived to the scene.
Attacks on state officials, mainly police and army officers, by unidentified assailants have been common in Egypt since the ouster of Islamist president Mohamed Morsi in July 2013.
After the death of the 26-year-old man, the Judges' Club – Egypt's only official judges' union, headed by Ahmed El-Zend – decided on Wednesday to host an emergency meeting to discuss the ongoing terrorist attacks targeting judges.