Blame: Was the death of Jill Wells an accident or murder?

ON MARCH 28, 2001, JILL WELLS WAS SHOT IN THE HEAD ON A REMOTE RANCH IN COLORADO'S EASTERN PLAINS. JILL'S HUSBAND SAID THEIR 6-YEAR-OLD SON ACCIDENTALLY PULLED THE TRIGGER -- BUT 9WANTS TO KNOW WHO IS REALLY TO BLAME?