I would need a dead body to practice on LOL I dont know what kind of marks you can make with no blood flow, you need blood pulsing throuh the veins to make a bruise. I think the state said yellow marks or grey marks are possible after death but red/blue marks are bruising from pressure on skin that has blood flow.
I really think he got mad at her either cause she went out and they got into a fight or he went out after she did and a fight ensued later. People can snap and do things w//o a bad home life. I think it happened in a fit of rage but only the jury's opinion is what matters now, like I said im glad im not them that would be a hard job.