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Robert Hanssen, a former FBI agent convicted of spying for Russia, was found dead in his prison cell at age 79. cbsn.ws/42omRbB | CBS Evening News

Twenty years ago today, the worst spy to ever penetrate the FBI was arrested at Foxstone Park near his home in suburban northern Virginia. Robert P. Hanssen was a veteran FBI agent with thwarted ambitions. Feeling underestimated he turned traitor. Beginning in 1979, he provided highly classified national security information to Russia and the former Soviet Union on and off through 2001. He pled guilty to 15 counts of espionage and was sentenced to prison with no parole. Hanssen remains one of th

Robert Hanssen, an FBI agent, was ironically given the critical task of finding a mole within the Bureau. Little did his superiors know, Hanssen himself was the mole they were desperately seeking. Beginning his clandestine activities in 1979, Hanssen sold highly classified information to the KGB and later to its successor, the SVR, in exchange for substantial sums of money and valuable assets. Throughout his espionage career, Hanssen compromised numerous operations and revealed the identities of