How to get a death certificate of the person to whom my mother was heir for working rights in Stephen county 16

I need a death certificate for Bonnie j fritz, to conclude heir ship to my mother, then to my brother and I. She passed in 09or10. My mom never filed affidavit of heirship before she died. I am person all rep for my mom. TY Gary miller

This is Oklahoma’s vitals. You might want to research it because of what they require from you in order to get a death certificate even of relatives these days.

https://www.ok.gov/health/Birth_and_Death_Certificates/Death_Certificates/index.html