I think he may have tried to kill himself after the deed if you notice his right hand is bandaged around the wrist. Which might explain the blood splatter by the car?
That's what I was going to say, looks like a lame attempt to cut his wrist, he should have cut his throat, ear to ear.
How dare that scumbag take the life of such a beautiful girl! I'm glad he survived his weak suicide attempt so he can die every day, stabbed by the Pork Sword, in jail for the rest of his life.