Guns dot com
This report contains an interesting piece of information. The distraught mom admitted that there had been an earlier incident in which the little girl got a-hold of a gun and pointed it at her mother. My theory has long been that the people who suffer these types of tragedies are not experiencing their first mishap. Negligent gun owners are repeat offenders. They keep repeating the misuse of guns until they're stopped.
The solution: a strict one-strike-you're-out policy.