A Russian businessman and associate of a Russian oligarch critical of Vladimir Putin was reportedly found dead at the age of 69.

Nikolai Glushkov, who served as a former deputy director of Aeroflot, was found dead in Britain, Russia's Business FM Radio station reported, according to The Telegraph.

A lawyer for Glushkov did not specify a cause of death.

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Berezovsky had helped Putin, Russia's president, rise to power before becoming a vocal critic of the man. In 2013, he was found dead at his home.

According to The Telegraph, Glushkov had been charged with fraud twice when in Russia.

He had denied the charges made against him. He told Russian media in 2016 that Aeroflot wanted to sue him in the High Court in London, according to the Telegraph.