According to WSOC, the autopsy suggests Kristen Stone could have been smothered, suffocated or drowned. Media outlets report that the pathologist couldn't give an exact cause of death.
Stone was found in the river by a fisherman on August 9.
Authorities charged 33-year-old Charles Cottingham with first-degree murder in Stone's death.
Court records indicate Cottingham was charged with sexually assaulting Stone a year earlier in Hoke County.