Destroyed Colony Deed NPC Didn't Leave

So I accidentally spawned in a cultist in my colony, immediately after spawning they went to lay down, as they were laying down I destroyed the colony deed, the game made the animation and sound effect of the cultist getting beamed out but the cultist stayed and now there's a cultist just walking around my colony and I can't kill them.

Does anybody have a fix for this, preferably without cheats but I will if I have to.

 

Lava.
Dig a hole under the top-layer of ground and then when they walk on it, destroy the ground itself. Put a little lava in there.

 

Unkillable cultists stalking your colony? Spooky.