The issue was over a sexual affair that Powell had with his trial lawyer.
But Governor Carnahan, with the understanding that the affair occurred after the sentence, decided that Powell received a fair trial.
Powell doesn't deny stabbing the two brothers 12 years ago when he was 18.
But his trial lawyer convinced him to turn down a plea bargin for life in prison -- a decision that may have been affected by her feelings for Powell.
The Governor's spokesman, Chris Sifford:
"We made a determination that his attorney did a very good job in representing him, and we feel that the jury's verdict and the judge's sentence were correct."
Courts from the circuit level to the Missouri Supreme Court have also refused to halt the execution. In Jefferson City, I'm Liz Cafer.