I am so, so sorry for your losses.
This happened to me too... had chickens for years with no issues, and then suddenly, every predator in the book found those chickens. AND while I was out of town, a raccoon tore up some pretty heavy wire (it was a BIG coon, paw print the size of the palm of my hand) and finished off the rest. So, we re-built. All our neighbors make fun of us for that coop and run but we don't care. It's very strong, it has a framework of steel pipe, so that even a bear would struggle to get in there. And yes, the run has steel pipe too. (And yes, we DO have bears.) I hope you don't have to go that far, but for where we live, we felt this was appropriate.
Best of luck for your new future chickens in their new future predator-proof-as-you-can-make-it coop and run. There are so many really cool breeds out there, you can spend the winter dreaming of new awesome chickens and learning about them.