Many have heard of the Slender Man case. Two 12-year-old girls decide to kill their friend, all in the name of a fictional character from the internet, called Slender Man. He's a tall, creepy-looking figure with long arms and legs - no face. But what really happened in the woods that day, when a young girl was stabbed 19 times? After new developments, Phelps digs into the interrogation tapes and sorts out the case.See omnystudio.com/listener for privacy information.