“Last Man to Die” (November 3, 1963) was the last Ellery Queen story to appear in This Week. Mercifully. Although some of the stories showed a glimmer of intelligence, none of the decades worth of stories really rose to the heights of the cousins other, longer, short stories. Hopefully, they helped pay the bills.
This one, though, involves a Butler’s Club. And, of course, the butlers did it. The old mainstays of drawing room mysteries are fading by 1963, so much so that “it was so long since he had seen a real live butler that it was like trying to bring a brontosaurus to life.”
Apart from that, Ellery proves a point, and awards $3million on evidence so flimsy it wouldn’t even be able to drag itself into a court of law.
Reading Ellery Queen 
Has this story been published in any of the Ellery Queen collections?
If memory serves, it appeared in Q.E.D.