This killing seems like it could be the core plot (and thematic?) element of the story, so I'm not sure that you should be backing into it vs. figuring it out first and letting the rest of the story fall into place around it. That being said, if you want it to be a completely lucid act, then it would have to be love turned to hatred. Maybe he "cheats" on her emotionally, or she finds that he is emotionally involved with her sworn enemy?
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