What the Bible says about Demons Will Die
(From Forerunner Commentary)

Luke 20:36 Does this verse mean that sinning angels will live forever? The only answer that squares with the rest of Scripture is that Jesus is referring only to righteous angels. They indeed do not die. Demons, though, will pay for their sins with death like every other unrepentant being. John W. Ritenbaugh Do Angels Live Forever? Related Topics: Death as Wages of Sin | Do Angels Live Forever? | Wages of Sin as Death