A former FBI agent convicted of espionage for Russia and serving a life sentence in a Colorado Supermax prison has died at the age of 79. The bureau confirmed Monday that Robert Hanssen was found unresponsive in his supermax federal prison cell at the ADX in Florence, Colorado around 6.55am. A cause of death has not yet been released, but officials say there is no threat to the public. Hannsen became notorious in the United States when he was arrested in 2001 and pleaded guilty to selling highly classified materials to the Soviet Union and later Russia for more than...