Back in the 1980s I worked with a guy and since we both lived near where we worked, we both went to our homes for lunch.He was in his 20s. One day I noticed that he had not came back and had not been at work for a couple of days. I asked the foreman what happened to Kenny. The foreman replied, His wife called in and said he died. He laid down on the couch after eating to take a short nap and when she tried to wake him up, he was dead. They investigated his case and run tests for over two years and one day I saw a short piece in the paper that they had run every test they knew and exhausted all investigative leads and they still could not determine a cause of death for him. So, who knows? He could have had some help or it could have been natural causes. At any rate, it is sad when some loses their life.
Back when I was in college there were two students who died in the dorm. Same room. Nothing came up. No one knew how or why they died.