[i]Allegedly[/i]
It seems he might have thought she was a burglar. However, there were "previous allegations of a domestic nature". My guess is that he found out she was cheating on him and killed her in a jealous rage because his sensitive handicapped pride couldn't handle the blow.
It looks to me like behind this "inspiration" might be just another dick.
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Roses are red, violets are blue, don't steal my shit or I'll -blam!-ing shoot you.