"Homicide is justifiable if committed . . . while resisting . . . murder . . . or felony . . . in any dwelling house." (§ 22-16-34). South Dakota does not have a duty to retreat as long as the person is in a place where they have the right to be.
Castle Laws are laws that address the use of force when defending one's self inside their home, or on their property. Some states expand this to vehicles, and the person's place of work. Castle Laws generally include: the places where this law applies, the requirements fro use of deadly force, if there is a duty to retreat, the amount of force that maybe used in defending one's self or others. These vary widely from state to state.