Former FBI agent Robert Hanssen, who was convicted of spying for Moscow, was found dead in his Colorado prison cell at the age of 79. The news of Hanssen’s death was confirmed by the Federal Bureau of Prisons, which did not release any further details about the cause or circumstances of his death. Hanssen was serving a life sentence without the possibility of parole for selling classified information to the Soviet Union and later Russia over a 22-year period, making him one of the most damaging spies in US history. His arrest in 2001 sparked a major scandal and led to a series of intelligence reforms. Hanssen’s case also inspired the Hollywood movie “Breach.”