New Jersey Statutes Title 3B. Administration of Estates Decedents and Others 3B § 3-13

(1) If a subsequent will does not expressly revoke a previous will, the execution of the subsequent will wholly revokes the previous will by inconsistency if the testator intended the subsequent will to replace rather than supplement the previous will.

(2) The testator is presumed to have intended a subsequent will to replace rather than supplement a previous will if the subsequent will makes a complete disposition of the testator's estate.  If this presumption arises and is not rebutted by clear and convincing evidence, the previous will is revoked;  only the subsequent will is operative on the testator's death.

(3) The testator is presumed to have intended a subsequent will to supplement rather than replace a previous will if the subsequent will does not make a complete disposition of the testator's estate.  If this presumption arises and is not rebutted by clear and convincing evidence, the subsequent will revokes the previous will only to the extent the subsequent will is inconsistent with the previous will;  each will is fully operative on the testator's death to the extent they are not inconsistent.