How would a 96 year old person eventually die with end stage heart failure and C.O.P.D., medicated to clear his throat?

Heart gives out, natural causes at age 96.

??? End stage heart failure means his heart will stop beating and that's how he'll pass. The rest of your post makes no sense. You may want to start a new post and fill in the rest of the missing information.

Chances are they will have a fatal cardiac event.