The headline reads "DA: Debt, Sex Drove Entwistle To Kill Family;" I disagree.
I say that an impotent piece of shit killed his wife outright, and should hang for it. Why the DA thinks that because this guy couldn't get it up with his wife, that that's somehow the reason for killing her. To murder someone, especially someone you supposedly love, for little or no reason is a surefire sign that not all of your dogs are barkin, as the expression goes. This guy is crazy. Period.
If there's enough evidence, then kill him, or at least put him in a box for the rest of his life.
Still, you've gotta see the irony of a Brit coming to Massachusetts and killing his wife with a handgun. Don't they have laws to stop things like this?