A Russian doctor who treated Alexei Navalny after his poisoning has suddenly died, hospital says

 A doctor who treated Russian opposition leader Alexei Navalny after poisoning last year has died, according to the hospital.

BUSINESS INSIDER

Fifty-five year old Sergey Maximishin, who was the deputy chief physician at Omsk Emergency Hospital No. 1, "suddenly passed away," his hospital said, according to a thursday CNN report.

The statement did not mention the cause of death, but Galina Nazarova, the press secretary of the Omsk region Ministry of Health, said that  Maximishin "died of a heart attack."

Navalny was rushed to the hospital on August 20, 2020, after falling ill on a flight from the Siberian city of Tomsk to Moscow, which had made an emergency landing in Omsk. Maximishin died in the same intensive care unit that hosted Navalny in August 2020, Radio liberty reported.

Navalny's chief of staff, Leonid Volkov, told CNN that Maximishin directly oversaw Navalny's treatment.