i think you need to sit down, katelynn." i was like, "what's going on?" i remember is just dropping to the ground. >> rachel's friend shannon couldn't believe what she read online. >> i found out through facebook. i was scrolling and saw someone post something, "r.i.p. rachel." and i was what the hell is going on? so then i called her younger brother, and he said somebody came into her house and murdered her. and i said, "what do you mean somebody came into her house and murdered her?" >> coming up, what had happened in that house? an eyewitness account from todd. >> get the children, get the children out here. >> and what does this box have to do with a long ago fire and death on a dark mountain? when "dateline" continues. you're doing what's right, to protect your dog from fleas and ticks for a full month. and it's the only chew, fda approved to prevent infections that cause lyme disease. nexgard. what one little chew can do. this is charlie not coughing because he took delsym 12-hour. and this is charlie still not coughing while trying his hardest not