Investigators searched Yevgeny Prigozhin s property in St Petersburg on June 24 this year after the Wagner chief s failed mutiny against Russia s defence ministry.
A private jet with 10 people on board has crashed in Russia - with the man who led a short-lived mutiny against the country's top brass on the passenger list.
Russian outlet Readovka, closely linked with Prigozhin, reported Wagner had a long-established mechanism of action in the event of the death of Yevgeny Prigozhin or Dmitry Utkin .