1203 GMT May 21, 2022
The former strongman had left office in April 2019 under pressure from the military, following weeks of demonstrations over his bid to run for a fifth term in office, AFP reported.
After quitting, he had stayed out of the public eye at a residence in western Algiers.
Bouteflika became president of Algeria in 1999 as the former French colony emerged from a decade of civil war that killed nearly 200,000 people.
Dubbed "Boutef" by Algerians, he initially won respect for helping foster peace, notably with an amnesty law that prompted thousands of opposition fighters to hand in their weapons.
Bouteflika went on to be elected for three more consecutive five-year terms, most recently in 2014.
Algeria was largely spared the wave of uprisings that swept the Arab world in 2011, with many crediting still-painful memories of the conflict in the 1990s for keeping a lid on tensions.
But Bouteflika's rule was marked by growing corruption, leaving many Algerians wondering how a country with vast oil wealth could end up with poor infrastructure and high unemployment that pushed many young people overseas.
In his later years, Bouteflika's ill health started weighing on his credibility as a leader.
Despite suffering a mini-stroke in April 2013 that affected his speech and forced him to use a wheelchair, he decided to seek a fourth mandate despite growing public doubts about his ability to rule.
His bid in 2019 for a fifth term sparked angry protests that soon grew into a mass movement against his regime.
When he lost the backing of the army, he was forced to step down.