The way situation is dealt with will of course vary from incident to incident. Assuming that the animals are being kept legally then even if they were to kill the owner I would think that because they are private property the would then become the responsibility of the next of kin. Just like any other thing that the owner had. They could in theory be willed to an individual or institution also I would think. The only reason that authorities would be involved would be if they animals were being kept in violation of municipal, state (or provincial) or federal law. Or if the person who became responsible for them requested the intervention of what ever kind be it animal control, zoo or what have you because they were unwilling or incapable of caring for the collection. In that instance the group that took possession of the animals would determine there fait based on what ever. But I highly doubt that even if the animal was euthanized it would be because it had killed someone. Or at least I hope not