Horrible tragedy, easily predictable and preventable. I agree with BC1. A four year old child has not reached the age of reason, and will get into things regardless of the level of guidance provided by even the best of parents. This is negligence on the part of the gun owner, pure and simple. It is absolutely your responsibility to ensure your firearm is stored in such a manner that it does not get into the hands of anyone who's not supposed to have it, period. If you have little kids in and about your house, your firearm needs to be locked up in some fashion or on your person.