Mwai Kibaki, the former Kenyan leader whose distinguished political career was tarnished when he won a second presidential term that was followed by deadly post-election violence, has died at the age of 90.

Kibaki’s death was announced Friday by President Uhuru Kenyatta, who said his passing was a sad day for the country and praised his predecessor as a great Kenyan and a statesman.

The cause of death was not given, but Kibaki was in and out of hospitals in recent years as his health failed.

“Mwai Kibaki will forever be remembered as a gentleman in Kenyan politics, a brilliant debater and one who steered development in the country,” Kenyatta said, declaring a period of mourning until his funeral is held.

Kenyatta described Kibaki as a “quintessential patriot whose legacy of civic responsibility will continue to inspire generations of Kenyans.”

Kibaki served two terms as president of the East African country, ruling from 2002 to 2013.

But his reelection to a second term in 2007 put a dent in his reputation as his victory was disputed by his opponent, Raila Odinga. Odinga asserted that the election result had been rigged and that he had really won the poll.

Hundreds of people were killed in weeks of ethnic violence that followed.

Amid the stalemate, Kenya exploded into fighting along tribal lines that forced more than 600,000 people from their homes. The violence shattered Kenya’s standing as a beacon of stability in East Africa.

The international community led by former U.N. Secretary-General Kofi Annan eventually brokered a fragile power-sharing deal between Kibaki and Odinga, who settled for a new role as Kenya’s prime minister.

But the International Criminal Court brought charges of crimes against humanity against Kenyatta, who had backed Kibaki, as well as William Ruto, the current deputy president. The ICC later dropped criminal charges against Ruto and Kenyatta, who had been charged for their alleged roles in the violence. They denied any wrongdoing.