Was he on any medications?.
“Was he on medications?”
That will have to come out with the back-story. I wouldn’t doubt it, though — as we have learned there is usually some up-down oscillation psychopharmacology in these family-shooting equations.
It is also indicative of something (MAYBE) that the shooter’s younger brother was in the house with his wife.
I wouldn’t doubt that the guy’s surrender was a function of his having run out of ammo.