Roy Horn, seen here in 2007 and one half of magician duo Siegfried and Roy, was to undergo a knee operation this week in Graz, southern Austria, the local daily Kleine Zeitung reported Sunday.(AFP/Getty Images/File/Ethan Miller)AFP - Roy Horn, one half of magician duo Siegfried and Roy, was to undergo a knee operation this week in Graz, southern Austria, the local daily Kleine Zeitung reported Sunday.


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