Who killed Hachi?


I need your help folks, but who was the guy who killed Hachi in his hut?
Didn't I pay right attention? In my translated german version this guy said something to Hachi that I didn't understand because it was so awfully synchronised. What did he say and who was he?

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For anyone who thinks it was the son:

Why would the son go to Hachi's house instead of going home? And eat his raw millet rather than getting a proper meal and seeing his wife and mother?

Even after killing Hachi, it doesn't appear that the killer goes to the other house.

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I've been going with Hachi's killer being a random guy over the past several viewings; that makes sense. A great film.

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