Okla. Stat. tit. 21, § 21-695: Confidential or domestic relation may be considered

Whenever the grade or punishment of homicide is made to depend

upon its having been committed under circumstances evincing a

depraved mind or unusual cruelty, or in a cruel manner, the jury may

take into consideration the fact that any domestic or confidential

relation existed between the accused and the person killed, in

determining the moral quality of the acts proved.