Okla. Stat. tit. 21, § 21-701.9: Punishment for murder

A. A person who is convicted of or pleads guilty or nolo

contendere to murder in the first degree shall be guilty of a Class

Y felony offense and shall be punished by death, by imprisonment for

life without parole, or by imprisonment for life. A person who is

convicted of or pleads guilty or nolo contendere to murder in the

first degree, as described in subsection E of Section 701.7 of this

title, shall be guilty of a Class Y felony offense and shall be

punished by death or by life without parole and absent an

overwhelming amount of mitigating evidence shall not be entitled to

or afforded the benefit of receiving imprisonment for life or

deferment of the sentence.

B. A person who is convicted of or pleads guilty or nolo

contendere to murder in the second degree shall be guilty of a Class

A1 felony offense punishable by imprisonment in the custody of the

Department of Corrections for not less than ten (10) years nor more

than life.