Officials must wait for lab tests to learn why an inmate died at the Benton County jail on Wednesday.
Jail staff found Robyn Montgomery Million, 58, unconscious in a housing unit while conducting a security check. She died a short time later after staff and medical personnel attempted to revive her.
Benton County Coroner John Hansens said the autopsy did not show a definitive cause of death. Lab tests will take six to eight weeks.
Sheriff’s officials said Million, who was in jail on a parole violation, had a history of drug use, and they believe she died of “natural causes.”
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Sheriff Steve Keane asked the Special Investigative Unit of detectives from other police agencies to do an independent investigation of Million’s death to avoid any conflict of interest.