Russia’s ambassador to Sudan, Mirgayas Shirinskiy, was found dead in the swimming pool at his home in Khartoum on Wednesday.
Police found him at his home in the country’s capital, Khartoum.
Doctors came immediately, but were not able to save him according to reports.
Shirinskiy, 62, had high blood pressure, and authorities believe he died of natural causes, said police.
Police spokesman Omar al-Mokhtar told Sudanese officials had taken Shirinsky’s body to a morgue in the capital and were awaiting instructions from the Russian foreign ministry.
A fluent Arabic and English speaker, Shirinsky had been a diplomat since 1977, the embassy said on its website.
He studied at Moscow Institute of International Relations and had been appointed as ambassador to Khartoum in 2013.
Shirinsky’s long diplomatic career also included postings in Egypt, Saudi Arabia and Yemen.
Shirinsky’s “friendly yet professional approach” helped improve relations between Moscow and Khartoum, the Sudanese foreign ministry said.
“He used to communicate with Sudanese people from all sections and sectors of the country,” a statement added.
Sudan and Russia have decades old diplomatic and economic ties, and President Omar al-Bashir is expected to visit Moscow soon.