The Sudanese foreign ministry first broke the news and it was later confirmed by the Russian foreign ministry on Wednesday evening.
Shirinsky is the ninth Russian diplomat to have died within a year. According to the press secretary of the Russian Embassy in Sudan Sergey Konyashin, however, the diplomat was found with signs of a severe heart attack.
"Preliminary investigation shows that his death was natural", police spokesman Omar al-Mokhtar told AFP news agency.
"We inform you with regret that Russian Ambassador to Sudan Mirgayas Shirinsky died in Khartoum on 23 August", the statement read.
Alexander Kadakin, Russia's former ambassador to India, died in January after a brief illness and Andrey G. Karlov, Russia's ambassador to Turkey, was killed at an art gallery in Turkey.More news: Police seize stash of Trump-shaped ecstasy tablets
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Shirinskiy manifested symptoms of an acute heart attack, embassy staff told the state broadcaster.
Sudan's foreign ministry expressed its condolences to Russian Federation in a statement, praising Shirinsky's diplomatic efforts. A doctor was called, but he could not save Shirinski, TASS reported.
Sudan's foreign ministry expressed its condolences to Russian Federation in a statement, hailing Shirinskiy's diplomatic efforts.
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.
He previously served as ambassador to Rwanda, and had diplomatic postings in Egypt, Saudi Arabia and Yemen.