Why would someone rather OFF their spouse than just leave them?

I honestly had a client that did this about 20 years ago, just a few years into my career. She had medical training. And access to certain drugs. She poisoned him and dumped into an abandoned tank on this ranch that she had access to. Very very smart girl but still the police knew almost immediately and leaned on her for 2 months until she confessed. And I love the YouTube videos on these subjects. But why would one think this would be necessary and would also work out 😂

Why would someone rather OFF their spouse than just leave them?
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