It’s not so simple and easy to get away from an abusive partner. They often put on a fake persona when meeting a new partner for the first time.
You might not realize how screwed up someone is until some time later, and it’s usually after they’ve sunk their claws into you.
If they’ve managed to work their tactics on people that should be your support network, it makes it even harder to leave and get help. The more skilled someone is at manipulating, the harder it is to see them as they truly are.
This woman didn’t deserve to die, and the husband is clearly a threat to society if he kills someone over a TV show.