Services for Taylor Paschal-Placker, 13, were planned at the church at 10 a.m. The funeral for Skyla Whitaker, 11, was set for 2 p.m. at the First Baptist Church in Henryetta.
Investigators said Friday they still have no suspects and no explanation for why they were gunned down Sunday afternoon near the small town of Weleetka, a working-class community of 1,000 people, 70 miles south of Tulsa.
On Thursday, crime scene investigators returned to the spot where the girls were found and searched nearby woods. Authorities also announced they had interviewed a witness who claims to have seen the girls just minutes before they were killed.
The girls, who were best friends, were shot a number of times in the head and chest with weapons of two different calibers, leading authorities to think two gunmen were involved.
Several motives have been explored, including a random thrill killing, attempted abduction, a case of mistaken identity and the possibility that the girls happened upon a crime in progress.
Oklahoma State Bureau of Investigation Agent Ben Rosser has said it is suspected that a local person was involved because the killings occurred in such an isolated area. Rosser said that nothing is being ruled out but that there is no indication family or friends were involved.
Full autopsy results have not been released, but investigators said it appears the girls were not molested. They noted the youngsters were clothed and the bodies were found only about a half-hour after the girls began walking.