N.C. Gen. Stat. § 31-5.7
Specific provisions for revocation exclusive; effect of changes in circumstances.
§ 31-5.7. Specific provisions for revocation exclusive; effect of changes in circumstances.
No will can be revoked in whole or in part by any act of the testator or by a change in the testator's circumstances or condition except as provided by G.S. 31-5.1 through 31-5.6 inclusive.