Okla. Stat. tit. 57, § 57-353.1: Minimum and maximum terms of confinement – Assessment of

terms by jury.

In all cases where a sentence of imprisonment in the State

Penitentiary is imposed, the court, in assessing the term of the

confinement, may fix a minimum and a maximum term, both of which

shall be within the limits now or hereafter provided by law as the

penalty for conviction of the offense. The minimum term may be less

than, but shall not be more than, one-third (1/3) of the maximum

sentence imposed by the court. Provided, however, that the terms of

this section shall not limit or alter the right in trials in which a

jury is used for the jury to assess the penalty of confinement and

fix a minimum and maximum term of confinement, so long as the

maximum confinement be not in excess of the maximum term of

confinement provided by law for conviction of the offense.