Bucklew was moments away from execution in May 2014 when the U.S. Supreme Court halted it and sent the case back to a lower court.
He suffers from a condition known as cavernous hemangioma. It causes weakened and malformed blood vessels, along with tumors in his nose and throat.
His attorneys have said Missouri's secretive execution drug could cause Bucklew to unconstitutionally suffer during the execution process.
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