Mehdi Nemmouche, 33, opened fire with a Kalashnikov assault rifle and a handgun at the city's Jewish Museum.
Three people died at the scene and one later in hospital.
Nemmouche spent a year fighting in Syria for the Islamic State (IS) group before returning to Europe to carry out the attack.
A man who helped plan the attack and supply weapons, Nacer Bendrer, was sentenced to 15 years in prison.
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