as Hermaan Hesse said :
to such men the desperate and horrible thought has come that perhaps the whole of human life is but a bad joke, a violent and ill-fated abortion of the primal mother, a savage and dismal catastophe of nature.
He looks like an aged and depressed Gordon Freeman. Dude is trying to fake mental illness. A domestic argument is no excuse to kill. Of all the murder weapons, why'd he pick a crowbar? He must have planned this after playing playing HL2.