His death not only marks the end of an era for a towering pan-Africanist, but also leaves a significant void in Kenya's opposition as the country heads towards the 2027 elections.

Although Odinga came from a famous Kenyan family, the political crown eluded him throughout his decades-long career - just as it eluded his father, who served as vice-president after independence from the UK.

In 2022, Odinga made his fifth attempt at the presidency, having come closest to the top job in 2008 when he was appointed prime minister in a coalition government.

In February, he lost the race to lead the African Union Commission to Djibouti's foreign affairs minister.

Despite his political misfortunes, Odinga remained a political force so influential that successive Kenyan presidents struggled to govern easily without his support.

Last year, President William Ruto reached out to Odinga for a political deal that saw opposition leaders appointed in the cabinet.

Four members of Odinga's ODM party joined what is now known as a "broad-based" government.

The move was seen by many as Ruto's attempt to solidify his hold on power amid increasing discontent with his administration over its perceived failure to improve the lives of poor people, while raising taxes heavily.

Odinga faced heavy criticism, especially from the young people behind last year's anti-government protests, who accused him of betrayal. He insisted that he only "donated" experts to help the president "save" the country.

An avid football fan and supporter of English premier league club Arsenal, Odinga came from the Luo ethnic group - the fourth largest in Kenya.

He had a passionate following, and his adoring fans has nicknames for him like "Agwambo" (Act of God) and "Tinga" (Tractor) - drawn from his party symbol in the 1997 election.

His signature slow-motion dance to reggae tunes at rallies - popularly known as "The Raila Dance" - became widely imitated by many in social gatherings.

In the 2022 presidential election, Odinga chose former Justice Minister Martha Karua as his running mate. This was widely welcomed, as it was the first time a presidential front-runner had chosen a female deputy.

Odinga was seen as the political heir to his father, Jaramogi Odinga, who was Kenya's first vice-president after independence, but walked out of the government in 1966 after falling out with then-leader Jomo Kenyatta, whose son, Uhuru, went on to become president after the advent of multi-party democracy in the East African nation.

Jaramogi Odinga favoured closer ties with the Soviet Union and China, while Jomo Kenyatta preferred an alliance with the US and other Western powers.

Their differences worsened, with Jaramogi Odinga imprisoned for 18 months until he was released in 1971.

Raila Odinga was also a former political prisoner, and holds the record for being Kenya's longest-serving detainee.

His struggle against one-party dictatorship saw him detained twice (from 1982 to 1988 and 1989 to 1991) during the rule of Jomo Kenyatta's successor, Daniel arap Moi.

He was initially imprisoned for trying to stage a coup in 1982, which propelled him on to the national stage.

After multi-party democracy was introduced a decade later, Odinga repeatedly failed in his attempt to win power, often saying he had been cheated of victory.

This led to one of the biggest political crises in Kenya's history, when about 1,200 people died and thousands fled their homes after Odinga was convinced that then-President Mwai Kibaki stole the 2007 election.

After mediation talks led by former UN chief Kofi Annan, Odinga took the post of prime minister in a coalition government, but his relationship with Kibaki was marred by what he called "supremacy wars".

In the 2017 election, he lost to Uhuru Kenyatta at the ballot box, but won in the Supreme Court, which nullified the result because of the widespread irregularities he had highlighted.

Odinga, however, boycotted the re-run, saying a level playing field had not been created.

This paved the way for the re-election of Kenyatta, while Odinga - reputed to be a master strategist and mass mobiliser - declared himself "the people's president" at a huge rally in the capital, Nairobi.

His supporters heeded his call to boycott the large number of businesses owned by the Kenyatta family to show their anger at the president's re-election.

The long-standing rivalry between Odinga and Kenyatta ended with a famous handshake in 2018. It culminated with Kenyatta backing Odinga's final bid for the presidency in 2022.

Odinga was also appointed by the African Union (AU) to mediate in the 2010-2011 political crisis that broke out in Ivory Coast after then-President Laurent Gbagbo refused to give up power after losing to Alassane Ouattara in elections.

However, his efforts failed to resolve the stand-off, as Gbagbo rejected him as a mediator, accusing him of being biased towards Ouattara.

In his spare time, Odinga was seen in the gym, and taking walks in his neighbourhood in Nairobi, and in his village in Siaya in western Kenya.

Odinga was married to Mama Ida and together they have four children - the late Fidel, Rosemary, Raila Junior and Winnie.

Fidel was named after Cuban leader Fidel Castro and Odinga once explained that he had chosen the name because his son was born at the height of the Cold War, and "Mr Castro was seen to be standing against the US in the Vietnam war".

Odinga may have been critical of US foreign policy, but he championed the creation of a Western-style democracy in Kenya.

He will probably be best-remembered as one of the founding fathers of multi-party democracy in Kenya, even if he felt that the electoral system was so flawed that it denied him the opportunity to become president.

Raila Odinga: A champion of multi-party democracy in Kenya