John A. Walker Jr., notorious ex-US sailor who spied for Soviets, dies in prison

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John A. Walker Jr., notorious ex-US sailor who spied for Soviets, dies in prison
FILE - In this Thursday, Aug. 15, 1985 file photo, John A. Walker Jr., is escorted by a U.S. marshal to the Montgomery County Detention Center in Rockville, Md. after a pretrial hearing in Baltimore. The former U.S. Navy Warrant Officer convicted during the Cold War of leading a family spy ring for the Soviet Union has died in a prison hospital in North Carolina, officials said Friday, Aug. 29, 2014. (AP Photo/Ron Edmonds)
FILE - In this Monday, Oct. 28, 1985 file photo, John A. Walker Jr. is escorted by a federal marshal as he leaves the Montgomery County Detention Center in Rockville, Md. enroute to a federal court in Baltimore. The former U.S. Navy Warrant Officer convicted during the Cold War of leading a family spy ring for the Soviet Union has died in a prison hospital in North Carolina, officials said Friday, Aug. 29, 2014. (AP Photo/Bob Daugherty)
John A. Walker Jr., accused of masterminding a family spy ring, is escorted by a federal Marshall as he leaves the Montgomery County, Md. Detention Center for a trip to a Baltimore federal court, Oct. 28, 1985. He and his son Michael, 22, are slated to plead guilty, according to government sources. (AP Photo/Bob Daugherty)
John A. Walker Jr., right, in chains, is escorted by a U.S. marshall as he returns to the Montgomery County Detention Center Thursday evening, Aug. 15, 1985 in Rockville after a pretrial hearing in Baltimore. The retired Navy communications expert is charged with espionage and will be tried on Oct 28. (AP Photo)
John A. Walker Jr., left, is escorted by a U.S. federal marshal as he leaves the Montgomery County Detention Center in Rockville, Md. for federal court in Baltimore on Oct. 28, 1985. Walker pleaded guilty to running a spy ring that sold sensitive codes to the Soviets that allowed them to read one million classified Navy cables. His 22-year-old son, Michael, is also accused of spying. (AP Photo/Bob Daugherty)
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By MICHAEL BIESECKER

RALEIGH, N.C. (AP) -- A former American sailor convicted during the Cold War of leading a family spy ring for the Soviet Union has died in a prison hospital in North Carolina, officials said Friday.

Retired Navy Warrant Officer John A. Walker Jr. died Thursday at the Federal Medical Center in Butner, Federal Bureau of Prisons spokesman Chris Burke said. The cause of death was not immediately released. He was 77.

Walker was sentenced to life in prison after pleading guilty in 1985 to passing secrets to the Soviets while he was a shipboard communications officer.

The security breach was then considered among the largest and most devastating leaks of military secrets in the nation's history.

A cryptologist, Walker used his high-level security clearance to provide Navy codes, ship locations, and other sensitive data in exchange for cash. After his 1976 retirement, Walker recruited his son, his brother and a friend to keep providing the Soviets fresh information. All were convicted.

Walker's spying career began in 1967, when he was based at the massive U.S. Naval Station in Norfolk, Virginia. Walker went to the Soviet Embassy in Washington and volunteered to hand over secret coded material on a regular basis, according to court documents.

Over the next 17 years, the Soviets used the information provided by Walker and his accomplices to decode millions of secret U.S. Navy messages and to learn about the tactics the Americans deployed against them.

After his arrest, prosecutors said Walker's betrayal of his country appeared motivated by greed rather than ideology.

In 1985, Walker agreed to plead guilty as part of a deal with prosecutors to obtain a lighter sentence for his son.

Former Navy Seaman Michael L. Walker served 15 years in prison and was released in 2000.

The brother, retired Navy lieutenant commander Arthur Walker, died at the Butner hospital in July.

The fourth member of the spy ring, Ex- Navy Chief Petty Officer Jerry A. Whitworth was convicted in 1986 and later sentenced to a total of 365 years. A database of federal inmates shows that Whitworth, now 75, is incarcerated at the Federal Penitentiary in Atwater, California.

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