Okla. Stat. tit. 63, § 63-3122: Declaration of death

An individual who has sustained either:

1. irreversible cessation of circulatory and respiratory

functions, or

2. irreversible cessation of all functions of the entire brain,

including the brain stem,

is dead. A determination of death must be made in accordance with

accepted medical standards; provided however all reasonable attempts

to restore spontaneous circulatory or respiratory functions shall

first be made, prior to such declaration.