'Gun was...': 7-month-old baby shot in the head by 10-year-old boy in Missouri

In a deeply troubling case from Missouri, a 10-year-old boy faces murder charges after a seven-month-old baby was shot and killed. Authorities arrived at a St. Louis residence where they discovered the infant, Kiyomi Parker, suffering from a gunshot wound. It has come to light that the young suspect accessed a firearm that was concealed under a mattress.