That'll teach him.

Ok...they said he was drunk....which means things probably got confused...he was probably just trying to get a stain out of her outfit and she took it the wrong way.....a good deed gone wrong fo sho....or maybe not.

I've said it before and I'll doubtless say it again - the only legal training I've ever had was watching LA Law, but I'm fairly certain that this means Yuki didn't murder her husband. I think if someone is trying emoliate you and you stab them to stop them, it's self defence. Even if they haven't got their matches out yet.