Okla. Stat. tit. 40, § 183

Should any employee enter such boiler, firebox, or smoke chamber, while the same is under pressure of steam, at the command or order of his employer, or the agent of such employer, and while inside of such boiler, firebox or smoke chamber, meet with an accident resulting in his death, the person or persons commanding or ordering him to enter such boiler, firebox, or smoke chamber, shall be guilty of manslaughter in the second degree, a Class D1 felony offense punishable as provided for in subsections B through F of Section 20N of Title 21 of the Oklahoma Statutes.