A former Russian secret agent identified as Alexander Litvinenko died eight years ago and an investigation has started causing allegations thrown against Russian President Vladimir Putin saying that he ordered the poisoning that led to the agent's death.

According to reports, the agent ingested a radioactive isotope polonium-210 and he has written a deathbed message regarding his murderer and he stood firm with his claim that it was Putin indeed. The British citizen's case is one of the most shocking cases according to Robin Tam, the inquiry's legal counsel.

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Tam said, "It is unusual for a victim of murder, as Mr. Litvinenko believed he might shortly be, to make a public statement about his own death."

Authorities are saying that Litvinenko might have ingested the said poison that was mixed with the green tea he drank while at the Pine Bar located at the Millennium Hotel in London's Grosvenor Square. British nuclear weapons experts have analyzed his urine hours after his death and it was also discovered in his hair samples that he might have been poisoned twice.

Ben Emmerson, the lawyer of the widow of Litvinenko identified as Marina, said, "Mr. Putin should be unmasked by this inquiry as nothing more than a common criminal dressed up as a head of state."

Emmerson added that Litvinenko was a whistleblower and his death was an act of nuclear terrorism. Litvinenko suffered 23 days in agonizing pain due to the poison and that he realized he was a victim of a political assassination by the Russian agents.

Emmerson pointed out, "He had to be eliminated, not because he was an enemy of the Russian state itself, and certainly not because he was an enemy of the Russian people, but because he had become an enemy of the close-knit group of criminals who surrounded and still surround Vladimir Putin."

The letter that Litvinenko composed while on his deathbed was read on November 23, 2007, a day after his death, by his friend Alex Goldfarb. The letter says he was proud to be a British citizen and that he loves his wife and son and it had no limit.

He also had a message for Putin which reads: "You may succeed in silencing me but that silence comes at a price... Howls of protest around the world will reverberate in your ears, Mr Putin, for the rest of your life."

Putin is yet to comment on the allegations and investigations are still ongoing.