A toxicology result has revealed the attacker at Orly Airport over the weekend had consumed a cocktail of drugs and alcohol.
After attacking police in a suburb of north Paris, 39-year-old Ziyed Ben Belgacem grabbed a soldier on patrol at the French capital's second-busiest airport and put a gun to her head.
He said he wanted to "die for Allah", and a scuffle between him and two other soldiers ensued, which resulted in him being fatally shot. The incident led to the airport being closed amid a major security scare.
Now, a toxicology result has found Belgacem was under the influence of alcohol, coupled with consumption of cocaine and cannabis.
Belgacem's family have been released after they voluntarily approached French police for questioning.
His father has insisted this was not an act of terrorism, and the cause was down to the substances Begacem had consumed.