Exploding potions will NOt actually kill a villager, even if all health is lost.

However, if health is not built back up, and the villager is in the weakened state, the normal things can kill him.
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arcadiarose Win Vista/AMD 64 AthlonX2/2.4 GHz/2 GB RAM/Direct X 9.0/256MB/NVIDIA/flatscreen + widescreen monitor/1280x1024 32-bit display