I can’t square why the glass from the bar was broken near John’s body.
If he went into the house and stayed for any length of time, why was the glass broken with him outside? When you finish a drink you sit it down.
If there was an altercation, did it happen before he finished the drink- and he kept it in his hand?
If someone harmed him and moved him outside- they had to know that this specific glass came in with him to take it outside and break it near him.
Too many questions- simplest explanation is she hit him with her car.