Thursday, May 15, 2008 Posted: 10:59 a.m. (CDT)

State medical examiners have not been able to determine the cause of death of a 13-year-old Tulsa girl whose skeletal remains were found five months after she disappeared.

Cori Baker disappeared November 9, 2007, after leaving school in east Tulsa with her sister's boyfriend. Baker's remains were found near a paintball course in Sapulpa on March 21.

The sister's boyfriend, 19-year-old Marquis Bullock, is now charged with first-degree murder in the girl's death.

Randy Saffell, of the state medical examiner's office in Tulsa, says there weren't enough of her remains to determine how she died.