Problem
A man comes home to find his wife violently abusing their 1-year-old daughter. The man intervenes and tends to the childs wounds. Two weeks later, the man goes to his daughter's school to pick her up. As he is driving home, he notices a bruise on her face (a left over bruise from his wife's attack on her). This enrages the man and when he gets to his home, he tells his daughter to stay in the car. He enters the home and kills his wife with a pistol he keeps at the house. In a common law Guthrie jurisdiction, what crime is he most likely to be found guilty of?