Russian Ambassador to Sudan Migayas Shirinskiy died Wednesday in the capital Khartoum, the Russian Foreign Ministry said in a statement.
The Agence France-Presse reported that Shirinsky was found in the swimming pool.
The Sudanese foreign affairs minister, who confirmed the information in a statement, did not give a cause of the death.
Embassy staff said he showed signs of a heart attack, and that they called an ambulance but doctors were unable to save him.
Shirinskiy is the fourth Russian diplomat to die this year, after Russia's Ambassador to the United Nations Vitaly Churkin died of a suspected heart attack, age 64.
Shirinsky's body was discovered by the employees of the embassy at his residence around 6pm local time (4pm BST), the press secretary of the Sudan mission, Sergey Konyashin, told RT News. The body was taken to a morgue in a Khartoum hospital and procedures were initiated to send it back to Russian Federation.
Russian Ambassador to Sudan Found Dead at Residence - Sudanese Authorities
Sudan's foreign ministry expressed its condolences to Russian Federation in a statement, praising Shirinsky's diplomatic efforts.
Russia's ambassador to Turkey, Andrei Karlov, was assassinated while speaking at an art gallery in Ankara in an act famously captured on video December 19.
Sudan's foreign ministry also praised the Russian ambassador's efforts to enhance diplomatic relations between the two countries while in office, but provided no details on the circumstances surrounding Shirinsky's sudden death.
"We grieve to announce that on August 23 in Khartoum the Russian ambassador to Sudan, M Shirinsky, died", it said.
He previously served as ambassador to Rwanda, and had diplomatic postings in Egypt, Saudi Arabia and Yemen.
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