Yes, sepsis is very dangerous. Many elderly people die of it.
He was only 68, he had other medical problems(Heart related, and a few strokes last year leaving him partially paralyzed) he had a caretaker, but getting septic shock, totally out of the blue, no one saw it coming. My brother in law got the quickest flight to Israel but he died while my BIL was at LAX waiting for the flight :(