The drama unfolded Monday night on the road between Richerenches and Valréas, in the Vaucluse.
Around 21: 00, a father was driving his car when he had an accident.
His 2 year old son, who was not properly restrained, was thrown from the vehicle by the violence of the shock. Transported to the hospital of la Timone in Marseille, he died Thursday of his injuries.
As for the dad, 32-year-old, he gets away with minor injuries.
The investigation revealed he was driving under the influence of alcohol and narcotic and under the blow of a cancellation of a licence.
It was already known by police as being a drug addict and drug dealer.