Update:  AP (excerpts):  Huntsville, TX - A Mexican national was executed Thursday for the rape-slaying of a teenager, after the US Supreme Court turned down an appeal to spare him that was supported by Mexico and the White House.  In his last minutes, Humberto Leal repeatedly said he was sorry and accepted responsibility.  "I have hurt a lot of people...I take full blame for everything.  I am sorry for what I did," he said in the death chamber.  "One more thing," he said as the drugs began ...

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