A federal judge has denied a request to stay the execution of a Missouri prisoner who suffers from a rare medical condition which he fears could cause an excruciating death. The judge also rejected Russell Bucklew’s request to have his execution filmed as evidence of cruel and unusual punishment. Bucklew’s lawyers have appealed. His execution, set for 12:01 a.m. Wednesday, would be the first since last month’s botched killing in Oklahoma. In both states, the source of the lethal drugs has been kept secret.