In damaging intelligence breach, Ames admitted to passing information to Moscow for nearly a decade

Aldrich Ames, the CIA agent who spied for the Soviet Union and Russia in one of the most damaging intelligence breaches in US history, has died in a Maryland prison. He was 84. His death on Monday was confirmed by the Bureau of Prisons.

Ames is best known as an ex-CIA agent who spied on the US on behalf of the Soviet Union. Ames, along with his wife, Rosario Ames, was arrested in February 1994 and pleaded guilty without a trial to espionage and tax evasion. Aldrich was charged with espionage, and his wife with aiding and abetting his activities.