I'm so sorry for your loss. I've got a coop with enough predator prevention on it to be Fort Knox, but I still worry. My MIL had raccoons get into a homemade coop a solid 20 years ago and I still remember the bits of chicken all over the yard. I'm a nurse now but I used to be a licenced veterinary technician, and still, it was awful.
Following on SegiDream's comment, I have an Aleko coop (the big one, six nest boxes, locks everywhere). I think it runs between $850 and $1100 depending on where you buy it and how you have it shipped. I was able to pick mine up at the Aleko manufacturing plant and so only paid $590. Great coop and great company.
What else. I have six Nite-Guard solar predator repellent thingys attached at different points--Google it for the real name. I also have Nite-Guard Repellent tape--it's this iridescent tape you either nail or stick or drape around the coop, and it sort of adds to the predator no-go zone.
We back to a greenbelt and have everything from raccoon to black bear (although the latter really doesn't want to be around humans, same for coyote) plus an osprey nest on a communications tower just behind the house. Hawks of all types are very common and we also have bald eagles and owls. I'm thankful for all of the wildlife, but I take precautions for my girls.
I'm newly back into chickens, but when I last had hens, around ten years ago, the Nite-Guard solar predator thingys worked very well. The girls had the inner door of their coop locked every night, of course, so maybe it was that, but the Nite-Guard product was durable and didn't hurt.
The last thing is, if I am letting the girls (Barnevelder, Bielefelder, and Appenzeller Spitzhauben) out into the yard to forage, my Anatolian Shepherd, Lily, is out with them. Anatolians are a livestock guardian breed, but please be aware that no dog of any breed is guaranteed to be good with chickens.
Again, my heart goes out to you this morning. Take care.