Hi badger! Sorry for your loss. I have a couple of losses as well.
You should clean out the dead bees. They will eventually mold in there. Use a brush or tap the frames to remove. You need to remove the hive or at least seal it up to keep it from being robbed. Mice might still find a home in there. I observed some recent mice chewing yesterday on an entrance reducer. No mouse, thankfully. Clean the bottom board as well.
You didn't mention why they died. Your description leads me to think their heads were in the comb, which means they starved. If there is any brood in there, you should check for foulbrood. If a toothpick, or similar tool, inserted into a larvae comes out ropey, you might have foulbrood.