Robert Hanssen, a former FBI agent who received more than $1.4 million for committing espionage on behalf of Moscow, died in prison, officials said.

The identification and business card of former FBI agent Robert Hanssen are seen inside a display case at the FBI Academy in Quantico, Virginia, May 12, 2009. Paul J. Richards/AFP via Getty Images.

FBI agent-turned-traitor Robert Hanssen, who spied for the old Soviet Union and later the Russians, died Monday in the cell where he was serving 15 consecutive life sentences for betraying his ...

WASHINGTON — Robert Hanssen, a former FBI agent who took more than $1.4 million in cash and diamonds to trade secrets with Russia and the Soviet Union in one of the most notorious spying cases ...

WASHINGTON — Robert Hanssen, a former FBI agent who took more than $1.4 million in cash and diamonds to trade secrets with Moscow in one of the most notorious spying cases in American history ...

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 ...

WASHINGTON, June 5 (Reuters) - Robert Hanssen, the former FBI agent turned spy whom the bureau describes as the most damaging in its history, was found dead in his prison cell on Monday, U.S ...

Robert P. Hanssen, a former FBI agent who pleaded guilty to spying for Moscow for years in one of the most devastating intelligence breaches in American history, died June 5 at the maximum ...

Former FBI agent Robert Hanssen, who was convicted of having spied for the Soviet Union and Russia for decades, was found dead in his prison cell Monday, authorities confirmed.

FBI agent Eric O’Neill, who was just 26 when he went undercover to help catch traitor Robert Hanssen, tweeted following the spy’s death that he’d hoped for one final face-to-face meeting ...

The arrest of traitor FBI agent Robert Hanssen devastated US intelligence agencies, raising more than a few questions about how he’d sold secrets for more than two decades. The spy met his ...

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.