Okla. Stat. tit. 12, § 110

Notwithstanding the provisions of Section 1 of this act, in the case of such an injury to property or the person or such an injury causing wrongful death, which injury occurred during the fifth year after such substantial completion, an action in tort to recover damages for such an injury or wrongful death may be brought within two (2) years after the date on which such injury occurred (irrespective of the date of death) but in no event may such an action be brought more than seven (7) years after the substantial completion of construction of such an improvement.