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In page Petra Kelly:

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Petra Karin Lehmann was born in Günzburg, Bavaria in 1947. She changed her name to Kelly after her mother married John E. Kelly, a US Army officer. She was educated in a Catholic convent in Günzburg and later attended school in Georgia and Virginia after her family relocated to the United States in 1959. She lived and studied in the United States until her return to West Germany in 1970.[citation needed] She retained her West German citizenship throughout her life.