The Russian doctor who was in charge of treating Alexei Navalny died suddenly at the age of 55, after being poisoned by neurologist Novichok.

Sergei Maximishin died of a heart attack after being taken to the hospital, where he worked on Wednesday night due to a spike in his blood pressure, Life.ru reported, Citing a Russian Health Ministry spokesman.

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“The doctors actually died of a heart attack, because they had a really stressful job and they really lost the people who were there for them.” Spokeswoman Galina Nazarova said.

In this handout photo provided by the Moscow City Court, Russian opposition leader Alexey Navalny spoke to one of his attorneys while standing in a cage during the hearing of a motion from the Russian prison service to change Navalny's suspended sentence from the 2014 convict Was.  An actual prison sentence in Moscow City Court in Moscow, Russia, Tuesday, February 2, 2021.  (Via Moscow City Court)

In this handout photo provided by the Moscow City Court, Russian opposition leader Alexey Navalny spoke to one of his attorneys while standing in a cage during the hearing of a motion from the Russian prison service to change Navalny’s suspended sentence from the 2014 convict Was. An actual prison sentence in Moscow City Court in Moscow, Russia, Tuesday, February 2, 2021. (Via Moscow City Court)

“It’s just the human heart,” she told the outlet.

Maximshin, who was the head of intensive care, died at his hospital’s cardiology ER in Omsk.

“He Gave 28 years to his local hospital, saved thousands of lives, and left many talented students who will carry on his legacy, ”said Omsk Region Health Minister Alexander Murakhovsky.

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“Sergei Maximishin literally” pulled his hands off even the most important, hopeless patients from the other side. “

Approximately 1,400 people have been arrested, mostly in Moscow and St. Petersburg, during heated protests on 17 January, the arrest of Navalny, 44, a fierce Kremlin critic who was detained when he returned to Russia from Germany, Where he had treatment for poisoning. Has been continued.

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Has been alive Ordered to serve 3 1/2 years After going to prison, officials ruled that his visit to Germany violated his parole.