http://news.yahoo.com/s/ap/20080806/...as_execution_4

HUNTSVILLE, Texas - The U.S. Supreme Court has denied Mexican-born condemned prisoner Jose Medellin's request for a reprieve.
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The court denied the request late Tuesday, more than three hours after Medellin's execution was to take place. The death warrant remains in effect until midnight CDT.

The 33-year-old Medellin claims he was denied treaty-guaranteed help from the Mexican consulate when he was arrested for the rape and murders of two Houston teenage girls 15 years ago.