John Walker Jr. | Spy for Soviets, 77
He died Thursday at the Federal Medical Center in Butner, Federal Bureau of Prisons spokesman Chris Burke told the Los Angeles Times via e-mail. Prison officials did not release a cause of death, and the North Carolina Medical Examiner's Office had no immediate information on the cause of death.
His brother Arthur J. Walker, 79, who made $12,000 for selling classified documents to Soviet agents through John, died in the same federal prison in Butner in July.
John Walker Jr. was said to have throat cancer. He was set to be released in May, according to federal authorities.
John Walker Jr. started spying in 1967 during his naval career and sold the KGB "vital U.S. cryptographic secrets that had allowed Russian agents to decipher approximately one million coded Navy dispatches," wrote Pete Earley, author of Family of Spies: Inside the John Walker Spy Ring. - Los Angeles Times