My Grandfather died when he was 86. He had been in a serious car wreck and was hospitalized for two weeks.
He was released from the hospital and Daddy took him home, put him in bed and left. Granddaddy lived way out in the woods. Grandmother was in a nursing home.
After a few hours, Mother and Daddy drove the 20 odd miles to check on him. When they got there they found that he had gotten out of bed, walked to the banks of a creek near his house. He had just sat down by the creek and died.
The sheriff and ambulance came tho there was obviously no need for the ambulance. The sheriff told my parents that since he did not die in a hospital, there would have to be an autopsy. Of course everyone knew he had died of a heart attack which is what the autopsy also revealed.
The point is that even if there was no suspicion at all, an autopsy was still required.
I have dispatch radio on 24/7. Every unaccompanied death requires medics to confirm and LE is invariably called to check it out. Invariably. I’m not sure about if someone dies and there are witnesses; that doesn’t seem to usually happen. Doesn’t matter if the person is known to be near death, always like that.