This verse, "A man or a woman who has a ghost or a familiar spirit shall be put to death; they shall be pelted with stones—their bloodguilt shall be upon them," is the last verse of the chapter. However, it appears to be in the wrong place. This verse should be much earlier in the chapter, specifically after verse 6 ("And if any person turns to ghosts and familiar spirits..."). In addition, the chapter has logically ended with the previous verse ("You shall be holy to Me, for I the Lord am holy...").
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Vs 6 says not to talk to the mystics (without addressing being a mystic); the rest of the chapter lists other crimes against God that separate persons from God, and whose crimes threaten the sanctity of the nation if the persons aren't removed from the nation. Vs 26 is the "refrain" command to be separated from the world and holy to God. So vs 27 then seems to underscore that the mystics themselves (already outside the realm of holiness because of the demonic-and-proud-of-it thing) should, if dying, be left to die.
I think it makes better sense in the Vulgate than the other texts, so Vulgate in English, Lev 20:27:
It would appear to be a means of emphasis after all that had preceded it.