Individuals linked to Putin's government have died in violent or mysterious circumstances.
Putin, a former lieutenant colonel of the KGB and ex-head of the FSB, has been suspected of assassinating critics.
Here's a list of people who have been critical of Putin and the Russian president is suspected of assassinating.
Prigozhin's unconfirmed end comes after a tumultuous few months.
He earned a reputation for publicly criticizing military leadership for their botched planning of the war in Ukraine, called out the Kremlin for misusing his Wagner mercenary troops, and eventually attempted a coup against Russian leadership in June that resulted in him and his troops being exiled to Belarus.
But Prigozhin's whereabouts since the exile — and his safety — have been up in the air, with the mercenary leader meeting with Putin in person just days after the failed mutiny and appearing weeks later at a critical summit with African leaders.
Prigozhin — once nicknamed "Putin's Chef" after the Russian President began eating at his restaurants and giving his catering business government contracts — appears to be the latest thorn in Putin's side to meet an untimely end.
In December 2022, the Russian tycoon reportedly fell from a hotel window in Rayagada, India, on December 25 days after his 65th birthday.
The politician and millionaire had criticized Putin's war with Ukraine on WhatsApp following a missile attack in Kyiv but quickly deleted the message and claimed that someone else wrote it, the BBC reported.
"Our colleague, a successful entrepreneur, philanthropist Pavel Antov passed away," Vice Speaker of the Regional Parliament Vyacheslav Kartukhin said on his Telegram channel, Russian media outlet TASS reported. "On behalf of the deputies of the United Russia faction, I express my deep condolences to relatives and friends."
Lukoil chairman Ravil Maganov had been openly critical of Russia's invasion of Ukraine, CNBC reported. Shortly after the war began, the oil company called for "the soonest termination of the armed conflict," per the report.
Maganov, similar to Antov, died by falling out the window of a Moscow hospital in September 2022, the outlet reported. However, a now-deleted statement from Lukoil said that the 67-year-old died "following serious illness."
Businessman Dan Rapoport publicly condemned the Russia-Ukraine war on social media multiple times and emphasized his support for Ukraine, the Daily Beast reported.
He was discovered dead in front of an apartment building in Washington, D.C, in August 2022, according to the report. Police said he had a Florida driver's license, a black hat, just over $2500, and orange flip-flops when he was found.
Russian press minister Mikhail Lesin was found dead of "blunt force trauma to the head" in a Washington, DC, hotel room in November 2015.
Lesin, who founded the English-language television network Russia Today (RT), was considering making a deal with the FBI to protect himself from corruption charges before his death, per the Daily Beast.
For years, Lesin had been at the heart of political life in Russia and would have known a lot about the inner workings of the rich and powerful.
Boris Nemtsov was a former deputy prime minister of Russia under Boris Yeltsin who went on to become a big critic of Putin — accusing him of being in the pay of oligarchs.
He was shot four times in the back just yards from the Kremlin as he walked home from a restaurant in 2015.
Boris Berezovsky was a Russian oligarch who fled to Britain after he fell out with Putin. During his exile he threatened to bring down Putin by force. He was found dead at his Berkshire home in March 2013 in an apparent suicide, although an inquest into his death recorded an open verdict.
The British police had, on several occasions, investigated alleged assassination attempts against him.
Natalia Estemirova was a journalist who sometimes worked with Politkovskaya.
She specialized in uncovering human-rights abuses carried out by the Russian state in Chechnya.
She was abducted in 2009 from outside her home and later found in nearby woodland with gunshot wounds to her head. No one has been convicted of her murder.
Stanislav Markelov and Anastasia Baburova
Human-rights lawyer Stanislav Markelov represented Politkovskaya and other journalists who had been critical of Putin.
He was shot by a masked gunman near the Kremlin in 2009. Journalist Anastasia Baburova, who was walking with him, was also shot when she tried to help him.
Alexander Litvinenko was a former KGB agent who died three weeks after drinking a cup of tea in 2006 at a London hotel that had been laced with deadly polonium-210.
A British inquiry found that Litvinenko was poisoned by FSB agents Andrei Lugovoi and Dmitry Kovtun, who were acting on orders that had "probably approved by Mr Patrushev and also by President Putin."
Anna Politkovskaya was a Russian journalist who was critical of Putin. In her book "Putin's Russia," she accused Putin of turning his country into a police state. She was murdered in 2006 by contract killers who shot her at point-blank range in the lift outside her flat.
Five men were convicted of her murder, but the judge found that it was a contract killing, with $150,000 paid by "a person unknown."
Paul Klebnikov was the chief editor of the Russian edition of Forbes. He had written about corruption and dug into the lives of wealthy Russians.
He was killed in 2004 in a drive-by shooting in an apparent contract killing, according to the Committee to Protect Journalists.
Sergei Yushenkov was a Russian politician who was attempting to prove the Russian state was behind the bombing of an apartment block.
He was killed in 2003 in an assassination by a single shot to the chest just hours after his political organization, Liberal Russia, had been recognized by the Justice Ministry as a party, the BBC reported.
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