The wife is no doubt a murderer and should be dealt with accordingly. Sadly I do know wives of alcoholics who often tend to get overly emotional and furious when their husbands return home drunk. Rather than seeking the proper channel of getting their spouse the help they need, the sober spouses simply try to get into heated discussions with their drunken other half, which in turn escalates into terrible disputes. Luckily non of them ended as bad as the case mentioned here, but it still is an awful thing.
Again my heart goes out to the kids and loved ones of the couple. Now they must bear the brunt!