Okla. Stat. tit. 58, § 58-30: Admission on testimony of one subscribing witness

If no person appears to contest the probate of a will, the court

may admit it to probate on the testimony or affidavit given after

the will has been filed of one of the subscribing witnesses only if

satisfied from the testimony or affidavit of such witness that the

will was executed in all particulars as required by law, and that

the testator was of sound mind at the time of its execution. This

section shall not apply to self-proved wills as described in Title

84 O.S., Section 55.