Russia’s ambassador to Sudan, a career diplomat with decades of service, was found dead at his Khartoum home on Wednesday, Russian and Sudanese officials reported.

The death of the ambassador, Mirgayas Shirinsky, who was in his early 60s, was at least the fourth time since December that a senior Kremlin envoy has died prematurely overseas. The Sudan Foreign Ministry said in a statement quoted by news agencies that Mr. Shirinsky “died this evening at his Khartoum residence” without providing a cause of death.

Agence France-Presse, in a dispatch from Khartoum, the Sudanese capital, quoted the Sudan police as saying he was found in the residence’s swimming pool.

His death came almost exactly six months after Russia’s longtime ambassador to the United Nations, Vitaly I. Churkin, died suddenly at work at the age of 64. Russia’s government did not disclose the cause of death for Mr. Churkin, whom it described as an “outstanding diplomat.”