A Chicago-born former Chicago Police Department officer who, as an FBI agent, took more than $1.4 million in cash and diamonds in exchange for trading secrets with Russia and the former Soviet Union in one of the world’s biggest spy cases, has died. notable in American history. in prison on Monday.
Robert Hanssen, 79, was found unconscious in his cell at a federal prison in Florence, Colorado, and later pronounced dead, prison officials said.
He is believed to have died of natural causes, a person familiar with the matter told The Associated Press. The person was not authorized to discuss the details of Hanssen’s death and spoke to the AP on condition of anonymity.
He had been serving a life sentence without the possibility of parole since 2002, after pleading guilty to 15 counts of espionage and other charges.
Hanssen had released a large amount of information about American intelligence gathering, including extensive details about how American officials had taken advantage of Russian spy operations, dating back to at least 1985.
He was believed to have been partly responsible for the deaths of at least three Soviet officers working for US intelligence and were executed after being discovered.

US Attorney Randy Bellows, right, addresses court during the sentencing of convicted spy Robert Hanssen, center, in federal court in Alexandria, Virginia. Hanssen pleaded guilty to 15 counts of espionage and other charges in 2001 and received a life sentence.
He received more than $1.4 million in cash, bank funds, diamonds, and Rolex watches in exchange for providing highly classified national security information to the Soviet Union and then Russia.
He did not adopt an obviously lavish lifestyle, instead living in a modest suburban house in Virginia with his family of six children and driving a Ford Taurus and a minivan.
Hanssen later said that he was motivated by money rather than ideology, but a letter written to his Soviet supervisors in 1985 explains that a large payment could have caused complications because he could not spend it without ringing warning bells.
Using the alias “Ramón García,” he passed 6,000 documents and 26 computer disks to his handlers, authorities said.
The records detailed espionage techniques, helped confirm the identity of the Russian double agents and revealed other secrets. Officials also believed that he had informed Moscow about a secret tunnel the Americans built under the Soviet embassy in Washington to eavesdrop.
It went unnoticed for years, but subsequent investigations found missing red flags. After becoming the center of a search for a Russian mole, Hanssen was caught sticking a garbage bag full of secrets to the bottom of a pedestrian bridge in a park in a “stalemate” for Russian controllers.
The story was made into a movie titled “Breach” in 2007, starring Chris Cooper as Hanssen and Ryan Phillippe as a young bureau agent who helps bring him down.
Hanssen, the son of a Chicago police officer, grew up in the 6200 block of North Neva Avenue, the Chicago Sun-Times reported in 2001 after he was charged with spying for Russia.
He graduated from Taft High School in 1962 and went on to earn a bachelor’s degree in chemistry from Knox College in Galesburg.
He attended Northwestern University dental school for two years before dropping out to pursue an MBA.
He went on to work for the Chicago Police Department, then joined the FBI in 1976, working in Indiana and then New York City.
Collaboration: David Struett
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