Depending upon the circumstances, a good lawyer could probably get you manslaughter on grounds of diminished responsibility (or whatever the US equivalent is), especially if you actually caught them at it, as given the circumstances, its reasonable that you'd be rather irate and therefore not fully responsible for your actions.
A good lawyer can get diminished responsibility for loads of stuff: I remember reading about a man who killed his wife with a hammer... but got manslaughter on diminished responsibility on the grounds that his wife nagged him too much...
A few years ago an irate husband cut his wifes head off and put hit on the hood of his car for sleeping around. I believe he got locked up for life in a nut house.
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