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ST. LOUIS (AP) - A federal appeals court has denied a stay of execution for a condemned Missouri man scheduled to die later this week, and the case is now heading to the U.S. Supreme Court.

The Eighth U.S. Circuit Court of Appeals on Monday declined to halt the execution of William Rousan. The appeal cited concerns that Missouri's execution drug, obtained from an unnamed compounding pharmacy, could potentially cause pain and suffering for the inmate.

Rousan's attorney, Philip Horwitz, says he will appeal to the U.S. Supreme Court. A clemency petition has also been filed with Gov. Jay Nixon. A spokesman for Nixon says the governor has not yet made a decision.

Rousan is scheduled to die by injection at 12:01 a.m. Wednesday for killing a southeast Missouri farm couple in 1993.

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