(CNN) Izzat Ibrahim al-Douri, a former top deputy to Saddam Hussein and more recently a key figure in Sunni extremist groups battling the Iraqi government, has been killed in a security operation in that country, Iraqi state-run television reported Friday.
Al-Douri was the highest-ranking member of Hussein's regime to evade capture -- the "King of Clubs" in a deck of playing cards used by American troops to identify the most-wanted regime officials.
He also was a man thought to have led the post-Hussein Sunni extremist group Naqshbandi Army. Military analysis website Globalsecurity.org says the Naqshbandi Army supports ISIS, which has taken over parts of Iraq and Syria.
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