Re: Dead Hive....
Take pictures of the comb and any capped brood left and post them for review. This is a real common problem this year and mites are the number one reason, especially if you treated late summer. I've lost two already and its not even winter yet. Strangely enough, our State Apiarist here in Virginia says he is also seeing a lot of nosema c.
Freeze and store the frames of honey for now. Make sure it was mites before you feed the honey to another hive.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.