No justification for killing a being. Yes the guy was protecting his sweat to avoid it been given to the woman alone. I thing the woman found out that the man outsmarted her. She then resorted to killing the man out of fraustration. Never an escuse. Bringing woman abroad is a big mistake .
One can just do noting to stop this kind behaviour. All you need is to make up your mind that such do take place and when it knocks on our doorstep. We endure. If you can't endure it. Separete yourself period.