18 year old female RanishaMcMaster(5 feet 4 inches tall, 110 pounds) was in a serious car accident, bleeding and disoriented, when she appeared at the front door of Roger Wafers at 1 am. She began banging, kicking and hitting the front door. From inside Mr. Wafers yelled "Who's there and what do you want?!" The kicking and banging continued. At that point, Wafers opened the front door and fired once with his shotgun, killing Ms. McMaster. Wafers is charged with Murder in the 2nddegree and Murder in the 3rd degree. Wafers pleads self-defense as a defense. Is the defense of Self-Defense a valid defense in this case? If you think it is a valid defense, why? If you think it isn't a valid defense, what should he be convicted of, Murder2 or Murder 3? Cite any case(s) and/or legal principles that support your position.