I read it a few months back. If I recall, the setup is that it is dark in the house at the time, lights went out so they only have candles I think, making it a little easier to pass off the cover up. Plus, that character is like the 5th (?) to die so can say that those remaining were pretty accepting that he’d be dead.

That said, when I was reading it, I was immediately suspicious of that death because of the way it was described. I didn’t quite get to the conclusion, but thought it was odd.