He could have been lost, or had a stroke. Both would have resulted in sitting down and succumbing to hypothermia.
Good point about the bruises. The article I read didn’t say where the bruises were primarily on his body, but someone who signed off on the death certificate was concerned enough to state thereon that the cause of death was undetermined.
The bureaucracies always want an autopsy. Its job security for them.
The only real question is whether foul play was involved. If he was lost or had a stroke doesn’t matter except to the family, and those govt weenies who want to protect their jobs.