After spending 13 years locked in a U.S. prison, a Cuban intelligence agent has been officially stripped of his American citizenship.

René González said Friday he received a certificate of loss of nationality from the U.S. diplomatic mission in Havana this week.

González, who was a dual national, volunteered to give up his U.S. citizenship in return for being allowed to stay in Cuba with his family.

The 56-year-old is one of the so-called 'Cuban Five." The men were convicted in 2001 of spying on U.S. military installations as well as exile groups and politicians.

He was released from federal prison in 2011 but ordered to serve three years of probation. The U.S. dropped its opposition to his returning home earlier this year, allowing the deal to go through.

Based on reporting by The Associated Press.

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