According to Police, two Polish nationals attacked the man and the woman, also from Poland, on the street, firing two shots at them, apparently for personal differences.
The man was fatally injured by one of the bullets and the woman was injured in the back by the second bullet.
The woman managed to flee and was picked up by a passing motorcycle. The motorcycle left her off at a distance from the scene of the shooting, where she was picked up by an ambulance and taken to Athens' Red Cross hospital.
Attica security police launched an investigation and were searching for the perpetrators.