Okla. Stat. tit. 19, § 19-215.4: Duties

The district attorney, assistant district attorneys, or special

assistant district attorneys authorized by subsection C of Section

215.37M of this title, shall appear in all trial courts and

prosecute all actions for crime committed in the district, whether

the venue is changed or not; the district attorney or assistant

district attorneys shall prosecute or defend in all courts, state

and federal, in any county in this state, all civil actions or

proceedings in which any county in the district is interested, or a

party unless representation for the county is provided pursuant to

subsection A of Section 215.37M of this title; and the district

attorney or assistant district attorneys shall assist the grand

jury, if required, pursuant to Section 215.13 of this title. The

district attorney may at all times request the assistance of

district attorneys, assistant district attorneys, district attorney

investigators from other districts, or any attorney employed by the

District Attorneys Council who then may appear and assist in the

prosecution of actions for crime or assist in investigation of crime

in like manner as assistants or investigators in the district.