Shannon Johnson has waived his right to further appeals of his conviction and death sentence and faces death by lethal injection early Friday.
But federal public defenders are trying for the second time to intervene in the case without Johnson's consent.
They are arguing on behalf of Johnson's sister that he is mentally incompetent and should not be executed.
But Johnson's lawyer says in a letter to the court that she spoke with Johnson on Monday, and that he remains committed to proceeding with his execution.
