Okla. Stat. tit. 58, § 122
Administration of the estate of a person dying intestate must be granted to some one or more of the persons hereinafter mentioned, and they are respectively entitled thereto in the following order:
8. Any person legally competent.
If the decedent was a member of a partnership at the time of his decease, the surviving partner must in no case be appointed administrator of his estate.
R.L. 1910, § 6245; Amended by Laws 1961, SB 84, p. 440, § 1, emerg. eff. March 3, 1961.