Navalny was an outspoken critic of President Vladimir Putin.
ナワリヌイ氏は辛辣な批判者でした、ウラジーミル・プーチン大統領の。
Russian authorities announced on Friday that Navalny had died in the prison colony where he was serving his sentence, but gave no details about the cause of death.
The independent Russian newspaper Novaya Gazeta Europe quotes another inmate as saying a "mysterious commotion" broke out on Thursday evening, then security was tightened, and vehicles could be heard driving into the compound.