Family and friends had urged Dale and Leilani Neumann to get help for their daughter, but the father considered the illness "a test of faith" and the mother never considered taking the girl to the doctor because she thought her daughter was under a "spiritual attack," the criminal complaint said.
"They responded, 'You won't need to do that. She will be alive by then,'" the medical examiner wrote in a report.
Falstad said the Neumanns have cooperated with investigators and are not under arrest. They have agreed to make an initial court appearance Wednesday, she said.
According to court documents, Leilani Neumann said in a written statement to police that she never considered taking the girl, who was being home-schooled, to a doctor.
Everest Metro Police Chief Dan Vergin said the parents once belonged to the Lighthouse Pentecostal Church but later became what he called religious "isolationists" involved in a prayer group of five people.