31 Miss. Code. R. 501-12.1
An individual who sustains fatal injuries may, prior to death, be transported to a hospital in a county other than that in which injuries occurred. Such deaths must be reported to the Medical Examiner of the county in which the death occurs as required by Miss. Code Ann. § 41-61-61. However, the death may subsequently be investigated and certified by the Medical Examiner of the county in which the fatal injuries occurred. In the event of a death of this type, the Medical Examiner of the county in which the death occurred will immediately contact the Medical Examiner of the county in which the fatal injuries occurred. Said Medical Examiners of the respective counties may then, at their discretion, make arrangements to either transfer or not transfer jurisdiction for further investigation and certification of the death, depending upon the specific circumstances and requirements of each individual case.
31 Miss. Code. R. 501-12.1