NC Deadly Force Law...no duty to retreat:
§ 14 51.1. Use of deadly physical force against an intruder.
(a) A lawful occupant within a home or other place of residence is justified in using any degree of force that the occupant reasonably believes is necessary, including deadly force, against an intruder to prevent a forcible entry into the home or residence or to terminate the intruder's unlawful entry (i) if the occupant reasonably apprehends that the intruder may kill or inflict serious bodily harm to the occupant or others in the home or residence, or (ii) if the occupant reasonably believes that the intruder intends to commit a felony in the home or residence.
(b) A lawful occupant within a home or other place of residence does not have a duty to retreat from an intruder in the circumstances described in this section.
(c) This section is not intended to repeal, expand, or limit any other defense that may exist under the common law. (1993 (Reg. Sess., 1994), c. 673, s. 1.)
I'm still confused if the Castle Doctrine has been passed or not? There is a petition and more discussion HERE