".....this dead butcher and his fiend like queen"- Who are thus described by whom and when ?

In Act 5 Sc 9 the great taragedy ,Macbeth by the greatest genius, William Shakespeare, this line has been told by Malcolm.

         Here, 'the dead butcher' refers to Macbeth for his murderous, villanious and slaughterous nature, and the 'fiend like queen' alludes to Lady Macbeth who helps her husband to achieve the kingship of Scottland by murdering king.

         After Macbeth's death at the hand of Macduff and eventually victory of Malcolm's force over Macbeth's, the nobleman of Scottland congregate under the leadership of Malcolm, the son Duncan and his rightous successor. In the statement of Malcolm where he announces the establishment of the new era of justice and virtue and the abolishment of the reign terror, he uses this above-mentioned line. But it is true that Shakespeare's play never represents Macbeth as a 'dead butcher' and nor his wife as a 'fiend'.