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Robert Hanssen, a former FBI agent who was one of the most damaging spies in American history, was found dead in his prison cell Monday morning, according to the Bureau of Prisons.
Eric O'Neill played a key role in bringing about the conviction of Robert Hanssen, who was found dead in prison on Monday, aged 79. Hanssen had sold US secrets to Russia for decades.
Agents who helped to bring down one of the most notorious Cold War spies tell us how they did it.
Eric O’Neill took to Twitter, saying he regrets not asking Robert Hanssen -- the former FBI agent who was sentenced to life in prison in 2002 for spying on America for Russia -- why he betrayed his homeland.
Former FBI agent Robert Hanssen, regarded as one of the most dangerous spies of the Cold War, has died in prison.