Question! Please help

first, I have to say, I really enjoyed this movie. I know I know-it WAS predictable but the story was original and the acting was great.

Before the questions I need to clarify I watched this off Netflix and had to walk out of the room a few times to tend to the puppy! So, it's plausible I missed something

So for the questions: what happened to the sister in law? Last I saw, our antagonist beat the hell out of the chief/dad and then saw the sister come home and tackled her. Did I miss something because after that, I only remember seeing the antagonist get out of the can, covered in blood, to turn himself in

Also, I keep reading about the murder off the chief/dad? Again, unless I missed something, he's last seen on a gurney in his house, looking like poop, but squeezes the protagonists hand?

Please help clarify!!!!