Okla. Stat. tit. 21, § 21-701.10-1: Sentencing proceeding - Murder in the first degree -

Life imprisonment.

A. Upon conviction or adjudication of guilt of a defendant of

murder in the first degree, wherein the state is not seeking the

death penalty but has alleged that the defendant has prior felony

convictions, the court shall conduct a separate sentencing

proceeding to determine whether the defendant should be sentenced to

life imprisonment without parole or life imprisonment, wherein the

state shall be given the opportunity to prove any prior felony

convictions beyond a reasonable doubt. The proceeding shall be

conducted by the trial judge before the same trial jury as soon as

practicable without presentence investigation.

B. If the trial jury has been waived by the defendant and the

state, or if the defendant pleaded guilty or nolo contendere, the

sentencing proceeding shall be conducted before the court.