narrator: meghan landowski the teenage victim, was someone he knew. he knew her whole family. it was her stepfather, chris, who found meghan's body as he came in from work. she was just white, just laying there as peaceful as she could be. then i went, i looked again. then i noticed-- i saw blood. sexually. >> assaulted and. >> she was bleeding. >> to death. >> to death. narrator: she was a tiny 16-year-old girl who cared about people and loved to dance. he couldn't comprehend what had just happened to her. could you tell how she had been killed? i recognized what i saw, but i wasn't processing what i saw, does that make sense? when i found chris, he was going into a state of shock and he had this distant look in his eyes. i still had the phone in my hand, and he was the one trying to bring me out of the trance that i was in. he pointed at his eyes and said, you know me. look at me. narrator: chris pulled himself together and called his wife angie at her office. her coworkers drove her home. so we get there, and they've got the house taped off and i'm running towards the house.

[music playing] narrator: the investigation into who murdered meghan landowski, the sweet 16-year-old loved to dance had shifted to her circle of friends and acquaintances. a few weeks in, investigators had a good lead. they were trying to connect that sneaker print found at the crime scene to neighbors of meghan's. you took these two people seriously, to have marshals come in. we took everybody that we thought would potentially could have done this, we took everybody serious. narrator: the men in question had left town not long after the murder. so you brought them back. did you interrogate them? when we brought them in and talked to them, we found that they didn't know meghan. narrator: and didn't know anything about her murder. their fingerprints, their dna didn't match what was left at the scene. but investigators had plenty of other people to talk to, starting with a high school full of potential suspects. so the day that she was killed, we went back and pulled all the video and tried to track meghan all the way through the school, just to see if there was any type of confrontati