Let's go. Go. >> to kill my dad. >> A quiet residential street in Florida is about to erupt into a war zone. But what triggers it isn't the gunfire, it's three words a child said to a 911 dispatcher just moments before officers arrive. Words that changed everything. >> Okay, I need but you said your dad, where's your dad? >> My dad killed mom. He just shot her. >> They don't know if the mother is still breathing. They don't know how many weapons are in that house.