Alexei Navalny, the fiercest foe of Russian President Vladimir Putin who crusaded against official corruption and staged massive anti-Kremlin protests, died in prison Friday, Russian authorities said. He was 47. Navalny, who was serving a 19-year sentence on charges of extremism, felt unwell after a walk, according to the Federal Penitentiary Service, and lost consciousness. An ambulance arrived to try to revive him, but he died. It said the cause of death was "being established.” Kremlin spokesman Dmitry Peskov said Putin was informed of Navalny’s death and the prison service would look into it in line with standard procedures. Navalny’s spokeswoman Kira Yarmysh said on X, the platform formerly known as Twitter, that the politician’s team had no confirmation of his death so far and that his lawyer was traveling to the town where he was held. Navalny had been behind bars since January 2021, when he returned to Moscow after recuperating in Germany from nerve agent poisoning that he blamed on the Kremlin. Before his arrest, he campaigned against official corruption, organized major anti-Kremlin protests and ran for public office. He had since received three prison sentences, all of which he rejected as politically motivated. Shortly after Navalny’s death was reported, the Russian SOTA social media channel shared images of the opposition politician reportedly in court yesterday. In the footage, Navalny is seen standing up and is laughing and joking with the judge via video link. Read more: https://www.9news.com/article/news/nation-world/russia-imprisoned-opposition-leader-alexei-navalny-has-died/507-dd5fdf5c-95c1-4a84-bc93-2ae76ecd22af