Okla. Stat. tit. 58, § 1004

Where a husband and wife have died, leaving community property, and there is no sufficient evidence to establish that they have died otherwise than simultaneously, one-half (1/2) of all the community property shall pass as if the husband had survived and as if said one-half (1/2) were his separate property, and the other one-half (1/2) thereof shall pass as if the wife had survived and as if said other one-half (1/2) were her separate property. Laws 1959, p. 395, § 4.