Tanzanian President John Magufuli has died, the country’s vice president announced after weeks of uncertainty about his health and whereabouts.

In a televised address to the nation late Wednesday, Vice President Samia Suluhu said the 61-year-old president died of a “heart condition” he had suffered from for a decade at a hospital in Dar-Es-Salaam.

Magufuli had initially been briefly admitted to the Jakaya Kikwete Cardiac Institute on March 6, but was then discharged, Hassan said on state television. But he was hospitalized again March 14 after feeling unwell.

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After the death was announced, opposition leader Zitto Kabwe said he spoke with Hassan to offer his condolences on Magufuli’s death. “The nation will remember him for his contribution to the development of our country,” Kabwe said in a statement posted on Twitter.

Under Tanzania’s constitution, Vice President Hassan, 61, was to assume the presidency for the remainder of the five-year term Magufuli began last year after winning a second term.