I heard a noise. It sounded like someone was in the house. I opened up her door to her bedroom and i thought, i am hearing things. Your instincts were right. Something happened in the middle of the night. You think your child is safe in your home sleeping. She was just 16. Emma, the honor student, cheerleader, volunteer. She could get along with anybody. Always so like kindhearted and sweet. She wanted to be a nurse and she had a plan. Reporter she went to sleep one sunday night and never woke up. I saw a 16yearold female laying in her bed. There was a bullet hole in the wall. She has been shot . Someone fired a shot from outside of the residence. Was emma a target . That weekend she seen a mysterious figure in black. She was shaking. Reporter now, two brave friends set out on a secret mission. Could they help catch her killer . You are trying to bring down a murder suspect. I just knew it was something that had to be done. This is insane. Everybody put your hands out the of the vehicle now. It all became a lot more real. Reporter hello, welcome to dateline. Emma walker was a spirited teenager with a nack of stirring up fun. Pretty and smart. But after her death the police had a tough investigation. Whoever shot her it would take a bold plan to catch her killer. Here is noises in the night. When the ought Imchill Seeps into the Community North of knoxville, tennessee, hundreds of School Students are drawn to the blaze of friday night lights to cheer on their hometown heroes, the bobcats. She was the friday nightlight that shown brightest of them all. Emma walker, a Bobcats Cheerleader since her freshman year. She was a really good cheerleader. Some would go through the motions and but emma put her own sparkle. They said their friend could be sassy. She would say, i am kind of a big deal. I am saying she said it with a hint of sarcastic. She is a super pretty cheerleader, but then meet her, she is the nicest person. Reporter they were her long time School Friends once you got to know her she is a downtoearth person and sweet. She had a smile that could light up a room. A big beautiful smile. Emmas parents say that smile was the hallmark her playful personality. She liked to play jokes on me. Grabbing my iphone and taking selfees selfie. Reporter she wanted to be a nurse. When we would talk about the different professions and get to the ones about babies, she would say that is what i want to do. Reporter no surprise she was noticed by boys at school. One boy she definitely noticed back. That is really all she liked talk about at first. Just like, he is super cute. Reporter he, was riley. Two years older than emma, popular, too. A stand out Wide Receiver on the bobcats football team. Did you think riley would make it to the nfl. If there was anybody to do it was going to be riley. Reporter he was not just a high school jock. He was active at church and loved star wars movies. Started out as a nerdy guy, that is how we met, obviously. Obviously [ laughter ] and then later in high school he got more into football but he kept with his nerd roots. He was really funny. I think that is why emma fell for him in the first place. They were both super goofy. She had a big crush on him. She did. Reporter just one problem. Riley already had a girlfriend but he broke up with her to date emma. Things got serious between the two of them . Dwrai. Reporter but as the months went by, it became Clear Riley The StarFootball Player was also, well, a player. It turned out his ex was not really an ex after all. He promised his Ex Girlfriend he would take her to prom that year and she would go to prom the next year. She let it go . Yeah. I guy with two girls on the go that is not cool. No t is not cool and she was young and, had a mind of her own and did not want us to voice our opinion about our concerns. Reporter emmas determination caused a lot of tension between her and her parents how does it work when you are trying to be good parents and your daughter has that strong personality. It is difficult. Very difficult. [ laughter ] she just was stubborn and thought her way was the right way. She wanted to learn for herself. Reporter emma and riley dated on and off for two years, riley graduated and went to college half an hour away. They tried to keep it going but emma Saw Snap Chats of riley with other girls on camp us and she broke up with him for good. The tension at home evaporated. It must of felt so good to be the happy family again . It is. The whole household was different. The household was not calm for very long. On november 20th, 2016, a sunday, emma went for ice cream with her dad and planned to get up early for school the next morning. I told her, good night, love you. Going to bed. During the middle of the night i, i heard a loud noise. What kind of noise was it . It sounded like someone was in the house and opened the door and slammed it. And i heard it again. Mark jumped out of bed to check on emma and her brother. I opened up her door to her bedroom and i stared at her for probably 15 or 20 seconds and, she was just lying asleep. In her bed. And, i shut the door and went to my sons bedroom and he was in the bed asleep. So i thought, i am hearing things. So, i checked the doors around the house and went back to bed. Reporter in the morning, emmas mom woke up early. I went in to wake her up and i could not wake her up. What was going on in your mind. I can not recall a lot of it. I just know that i checked for a pulse. And there was no pulse . No pulse. No. Emmas Younger Brother Evan rushed in. Poor evan i am sure that is something. I wish he never had to experience it. It is like a nightmare. [crying] reporter jill calmed 911. I just tried to wake up my daughter for school and she has no pulse. She is nonresponsive . What had happened to emma walker . [crying] coming up. The investigation begins. I saw a 16yearold female laying in her bed with a small amount of blood in her pillow. People thought she might of overdosed on something. They thought she ingested poison or whatever this is a mystery right now. It is all a mystery. When dateline continues a when dateline continues copd hasnt been pretty. Its tough to breathe and tough to keep wondering if this is as good as it gets. But trelegy has shown me that theres still beauty and breath to be had. Because with three medicines in one inhaler, trelegy keeps my airways open and prevents future flareups. And with one dose a day, trelegy improves Lung Function so i can breathe more freely all day and night. Trelegy wont replace a Rescue Inhaler for sudden breathing problems. Tell your doctor if you have a Heart Condition or high Blood Pressure before taking it. Do not take trelegy more than prescribed. 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What are you talking about . It did not register in my mind like. Not our emma, no. Reporter did not seem real to nathan, either i was like, yeah, that is my best friend but she did not pass away. It just hit me. I started balling. Reporter emmas ex boyfriend was in college. He grieved on social media how much he loved her and will misher. She does not deserve this. She is in a better place now. Tell god about your verse. Did their hearts go out to riley, he lost a lot of people commented i am so sorry. Prayers for you. Still, no one knew, yet, how emma died. What are some of the rumors now floating around on social media . About what happened to emma. People had thought she might of overdosed on something. People said brain bleed. Reporter the biggest one that upset us the most were people who did not know her saying she killed herself. Reporter was there and part of you that was confused and thinking, maybe it is possible. You know that she has not survived whatever has happened but you dont know what. It is all a mystery. Investigators arrive with sketchy details from First Responders they thought, originally, it was a suicide, she ingested something. A poison or whatever. Reporter knox county major was assigned to investigate the case with major climb detective merit. I saw a 16yearold teenager liing in her bed with a small amount of blood on her pillow. Some people confused that with that she gotten sick or had ingested something and caused her to vomit. When the detective looked closer he saw something unusual. First responders did not immediately see the hole in the wall. Reporter there was a hole in the wall next to emmas bed. A bullet hole. Only a little blood visible on the pillow, when the investigators investigated her head there was a small entry wound. So she has been shot . Yes, maam in her own bed. The bullet struck her just left and above the ear. It was a fatal wound. Reporter she had to have been shot then through the wall . Yes. It was obvious someone had fired a shot from outside of the residence into the residents striking her in the head. Reporter this is not the kind of neighborhood with drive by shootings, right . Yes, maam, it is a low crime rate area. Reporter as the detectives processed what is now a crime scene, they found more clues as to what might of happened we go outside of the residence. That is where we determined that there was a second shot that had been fired through the inwall part of the house and there in the walkers yard. We find a shell casing, a spent casing that had been fired and then as we again work around we find a spent casing and a live round. Reporter when emmas parents learned what happened they barely had been taken it . They told us she had been shot. It is unthinkable. Reporter emmas father recalled the noises that he hard during the poit knowing those noises that i heard were gunshots and they sounded nothing like gunshots. But your instincts were right. Something happened in the middle of night. You think your child is safe in your home, sleeping. Reporter but who would want to kill this sweet popular girl whose goal in life with to care for newborn babies . It turned out the last few days of emmas walkers life was anything but normal and might be key to the unraveling the mystery. Coming up. She sees a person dressed all in black. A mysterious figure at emmas door this person comes to the front door and starts to try to get in the house. Turning the doorknob, she is in fear. In panic. I would have been terrified. Absolutely. When dateline continues ter absolutely. When dateline continues 3 out of 4 people achieved 90 clearer skin at 4 months. And skyrizi is just 4 doses a year after 2 starter doses. 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Emma walker was shot dead in her own bed. At 16 years old, she had her whole life ahead of her. Emma walker was shot dead in her own bed. At 16 years old she had her whole life ahead of her. All of the great things she would have done. Yeah. Proms, graduations and things that we never get to see, you know. Getting married, having kids. Reporter as emmas family began imagining life without her the police were focused on finding her killer. They were talking to her family and friends about the days before the shooting. That is a lot of activity in a period of two days unexplained. Reporter it was the weekend before thanksgiving. Friday night emma and her group were celebrating a football win at a friends house. Emma received a message from an unknown number. The message said something about riley, he had been taken. Someone has riley . Yes. Someone kidnapped him. Reporter riley, kidnapped . The strange messages kept coming. Then, emmas phone rang and riley was on the line help me, help me, help me, emma you can hear riley on the call, calling for help . Yes. Emma and her friends rushed out of the house and there was riley. He had his hands on his head, he looked confused. I saw her yelling at him. She was really angry. Reporter emma was furious, she and her friends thought the whole thing was some kind of prank. We were all, oh, it is far fetched for him to be kidnapped. We did not think twice about it. If the kidnapping was a joke what happened the next morning was no laughing matter. Friends said that saturday she drove herself home from her friends house. As she was pulling in approaching her residence she sees a person dressed all in black and as she gets closer, you know, he gets his hood up and puts the glasses on. Emma was texting her friends as she gets in the residence this person comes to the front door and starts trying to get in the house, turning the door knob. She is in a fear, she is in a panic. She reaches out to the one person that she thinks can help her that was riley. Emma just broken up with riley and angry about what she thought was that strange Kidnapping Stunt the night before. Still, she texted him this. I hate you but i need you right now. She face time called him and asked h