List of Famous people who died at 31

Laurent Vidal was a French professional triathlete, three time French Champion and two time Olympian. In Beijing 2008 he placed 36th while he took the 5th place in London 2012.

Malik Mumtaz Hussain Qadri, better known as Mumtaz Qadri, was the assassin of Salmaan Taseer, Governor of Punjab. Qadri was a commando of the Elite Police and, at the time of the assassination, a member of the squad of personal bodyguards assigned to protect Salmaan Taseer. A follower of the Barelvi version of Sunni Islam, he assassinated Taseer on 4 January 2011. He claimed to have killed the Governor because Taseer spoke in defense of Asia Bibi, a Pakistani Christian woman convicted of blasphemy and sentenced to death. Qadri was convicted by the Islamabad High Court, sentenced to death and hanged in February 2016.

Isaac Promise was a Nigerian footballer. He was the captain of the football team representing Nigeria which won the silver medal at the 2008 Summer Olympics in Beijing. He played professionally for 14 seasons, much of which was spent in Turkey. He scored a total of 77 club goals during his career.

Mohamed Salmene Lahouaiej-Bouhlel was a Tunisian Muslim terrorist living in France who carried out the 2016 Nice truck attack, in which he drove a truck into a crowd celebrating Bastille Day on the Promenade des Anglais in Nice, France, killing 86 people and injuring 458. Immediately after the attack, Lahouaiej-Bouhlel was shot dead by responding French police officers.

Major Mohit Sharma, AC, SM was an Indian Army Officer who was posthumuously awarded the Ashoka Chakra, India's highest peace-time military decoration. Maj Sharma was from the elite 1st Para SF. He was martyred in action on 21 March 2009 while leading his Bravo Assault Team in Kupwara district.

Julia Viellehner was a German long-distance duathlete and triathlete who competed in long-distance world duathlon and triathlon championships.

Mohamed Abarhoun was a Moroccan professional footballer who played as a defender. He played domestic football for hometown club Moghreb Tétouan, Portuguese club Moreirense, and Turkish club Çaykur Rizespor. Abarhoun also represented Morocco at under-20, under-23 and senior level. He died of stomach cancer at the age of 31.

Leonard Harris Sassaman was an American technologist, information privacy advocate, and the maintainer of the Mixmaster anonymous remailer code and operator of the randseed remailer. Much of his career gravitated towards cryptography and protocol development.

Alaa Ali was an Egyptian footballer who played as an attacking midfielder.

Masao Fujii was a professional baseball player for the Fukuoka Daiei Hawks in Japan's Nippon Professional Baseball. He was born in Nishi-ku, Fukuoka and raised in Karatsu, Saga.