He killed his own brother, and then tried to alleviate his guilt by adopting his nephew. He was infested by his own murdering scent, and drowned by his paranoia.
The only good thing is that the kid is not going to be killed since there is no one to avenge the man but I wonder if he is going to die because of it.
Wow, Shigeru(?) killed his own brother because he was unable to forgive him for the death of his daughter. I thought it was really sad at the end when Sosuke let Shigeru drown after he found out what really happened to his dad. Very depressing chapter.