I mean in the death of a wife/girlfriend the man is always gonna be a suspect, so it makes OJ REALLY look guilty when he was not only beating her, but telling her he was gonna kill her. The fact that she had a safe deposit box and a will with pictures after different beatings lets you know there was a good chance that she thought he'd do it.
the cop when he said the first thing he heard over the phone when he told her family she was dead was her sister in the background saying she knew that motherfukker was gonna do it.
Domestic abuse often leads to death but I understand what you're saying, it's not set in stone that will be the outcome. A coworker of mine got really emotional when we were talking about the case during the FX show. She was like he fukking did it I've been in abusive relationships before. I wanted to say well you're not dead