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Alice and Ellen Kessler perform in 1976.

Alice and Ellen Kessler, German twin sisters whose singing and dancing talents made them famous across Europe in the 1950s and '60s, died by joint assisted suicide on Monday, according to the German Society for Humane Dying.

They were 89.

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"They had been considering this option for some time. They had been members of the organization for over a year. A lawyer and a doctor conducted preliminary discussions with them," the organization said in an English-language statement.

"People who choose this option in Germany must be absolutely clear-headed, meaning free and responsible," the organization added. "The decision mus

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