Okla. Stat. tit. 22, § 22-1162: Jury to try sanity

When an indictment or information is called for trial, or upon

conviction the defendant is brought up for judgment, if a doubt

arise as to the sanity of the defendant, the court must order a jury

to be impaneled from the jurors summoned and returned for the term,

or who may be summoned by direction of the court, to inquire into

the fact.