I’m so sorry. Such a terrible thing to wake up to ( lost 2 to a possum myself over the weekend) Terrible isn’t even the word unfortunately the predator will be back. Once they know where they got their meal they will come back. If possum or raccoon first thing I would do is put a cover on the run. Raccoons especially are crafty. Great nigh vision they can dig, climb, squeeze through surprisingly small areas and unlatch door latches. I am so so sorry.