They died within a month of each other.
This is actually something that happens quite often in older couples, and has been studied by the medical/psychological community. I actually did research, and a few papers on it. You'd be surprised at how many couples make it to 50 years of marriage and then both die within a year of that. I believe it is just a physical manifestation of true love, and the inability of some couples to be without each other.
Reasons to Go
You are the person to visit
Thanks to Theme World for the font Alpine