Okla. Stat. tit. 58, § 58-133: Proof of death intestate

Before letters of administration are granted on the estate of

any person who is represented to have died intestate, the fact of

his dying intestate must be proved by the testimony of the applicant

or others; and the court may also examine any other person

concerning the time, place and manner of his death, the place of his

residence at the time, the value and character of his property, and

whether or not the decedent left any will, and may compel any person

to attend as a witness for that purpose.