The 79-year-old Hanssen was found unresponsive in his cell at a federal prison in Colorado and later pronounced dead, prison officials said. He is believed to have died of natural causes.
Robert Hanssen, an FBI agent who was convicted of spying for Russia, dies in prison – Nation & World News wuft.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from wuft.org Daily Mail and Mail on Sunday newspapers.