More details added (no cause of death at this time):
The prison service in the Yamalo-Nenets district said he had “felt unwell” after a walk on Friday.
He had “almost immediately lost consciousness”, it said in a statement, adding that an emergency medical team had immediately been called and tried to resuscitate him but without success.
Sources state he suffered from a long-term polonium addiction.
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It was a fucking joke bozo why would he be addicted to a toxic isotope?