FBI Agent And Russian Spy, Robert Hanssen Found Dead

A former FBI agent serving a life sentence for espionage has died at the age of 79.

The bureau confirmed on Monday that Robert Hanssen was found unresponsive in his supermax federal prison cell at the ADX in Florence, Colorado at around 6.55am.

Responding crew members initiated life saving measures, the bureau said in a statement, but Hanssen was ultimately pronounced dead by outside medical personnel.

A cause of death has not yet been released, but officials say there is no threat to the public.

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Hannsen became notorious in the United State when he was arrested in 2001 and pleaded guilty to selling highly classified materials to the Soviet Union and later Russia.

He was only 20 years into his 15 consecutive life sentences for espionage, conspiracy to commit espionage and attempted espionage at the time of his death.

Robert Hanssen was serving 15 consecutive life sentences in federal prison after he pleaded guilty to espionage charges.