Okla. Stat. tit. 21, § 21-731: Excusable homicide, what is

Homicide is excusable in the following cases:

1. When committed by accident and misfortune in doing any

lawful act, by lawful means, with usual and ordinary caution, and

without any unlawful intent.

2. When committed by accident and misfortune in the heat of

passion, upon any sudden and sufficient provocation, or upon a

sudden combat provided that no undue advantage is taken, nor any

dangerous weapon used, and that the killing is not done in a cruel

or unusual manner.