
Alexei Navalny was about to be freed in a prisoner swap when he died, according to his ally Maria Pevchikh.
She said the Russian opposition leader was going to be exchanged for Vadim Krasikov, a Russian hitman who is serving a life sentence for murder in Germany.
Two US citizens currently held in Russia were also going to be part of the deal, Ms Pevchikh claimed.
She added that negotiations were at their final stage on 15 February.
The next day, Mr Navalny died in his cell in the prison colony in Siberia where he was being held on a 19-year sentence over charges that were widely seen as politically motivated. Prison officials said the 47-year-old had fallen ill following a "walk".