On and after July 1, 2004, whenever the death of a prisoner in the custody of a city or county and residing in jail or in a facility contracted through the city or county, or both, occurs, an investigation regarding the circumstances of the death shall be initiated by the Kansas bureau of investigation. A report of the findings of the investigation shall be made available to the chairperson of the senate judiciary committee and the house corrections and juvenile justice committee of the Kansas legislature and shall be subject to the open records act, Kan. Stat. Ann. § 45-215, and amendments thereto. No such investigation by the Kansas bureau of investigation shall be required if the cause of death is determined to be natural, by a qualified autopsy, preliminary autopsy report or death certificate or the prisoner was regularly attended by a licensed physician.