Muo Salh, a manager at the AmeriStop on Nilles Road near Johnsons residence, said Johnson had stopped in the store at about 12:30 p.m. Sunday, the last day she was seen.
Salh said she was with her neighbor, whom he had seen before, although he could not identify the man. That neighbor bought a prepaid phone card, and then he and Johnson left, heading west on Nilles Road. Salh said he relayed this information to police.
The Butler County Coroners Office determined Johnson was stabbed to death, but are awaiting lab tests to determine the presence of drugs or alcohol in her body. Coroners Investigator Andy Willis said there are no visible signs that Johnson was sexually assaulted, but further testing is also needed.
Detectives are also working to determine where Johnson was killed .
We dont know if it was there (where she was found) or somewhere else, Dickey said. He declined to disclose how many times she was stabbed or if a weapon was found at the scene.