A 16-year-old woman whose cheerleader was killed in her bedroom, recalled hearing two knocks on the door that night, breaking up with her boyfriend a few months before the case, and several strange incidents that followed, all inextricably linked to her ex-boyfriend. The story takes place in Knoxville, Tennessee, the victim is named Emma, she was born in 2000, when she attended Knoxville Central High School, which is a public high school, the school has a team called Bobcats, the team is good, more famous in the surrounding area, Emma has a cheerful personality, good relationships, she is the cheerleader of the school team, Emma's dream is to become a neonatal nurse. In an American football game at school, Emma met a boy named Riley, Riley was two years older than Emma, he was not only the main player of the school team, his academic performance was also very good, Emma was the captain of the cheerleader, they often saw each other, and over time the two developed a good feeling, Riley resolutely chose to break up with his current girlfriend in order to be with Emma, and Emma became lovers. The two often post photos of them together online, an enviable couple in the eyes of friends. Soon Emma's parents met Riley. Riley was polite in front of them, not only did he have good academic performance, but he was also physically fit, and most importantly Riley loved his daughter. Emma's parents had a good impression of Riley, and they often invited Riley to their homes. As Emma and Riley spend more time together, Riley slowly becomes different from when they first interacted, and he shows a strong possessiveness toward Emma, he begins to forbid Emma to go to parties with friends, and also asks Emma not to dress indiscriminately, and must dress according to Riley's preferences, Riley does not like Emma to do anything without her presence. Riley's attitude towards her daughter was unexpected by Emma's parents, and they were so disappointed and angry that they would not allow Emma to associate with Riley anymore. At that time, Emma was in the rebellious period of youth, she could not listen to the advice of her parents, she felt that Riley's behavior was just too concerned about herself, so she ignored her parents' advice and insisted on continuing to be with Riley, Emma was very stubborn, during that time her relationship with her parents also fell to the freezing point, and as time passed, Riley's behavior became even more intense. One day Emma is surprised to find that Riley has taken her ex-girlfriend to a dance party, to which Riley says she has promised the family earlier. However, after this incident, Emma still did not break up with Riley. Emma's parents are worried, they think that Riley does not like Emma at all, if not stopped, I am afraid that there will be problems, and then Emma's parents began to intervene strongly in the relationship between the two, they forbade Riley to come back to their home, and did not receive Emma's mobile phone, trying to control the opportunity for Emma to communicate with Riley. Riley learned of the situation and gave Emma a cell phone. In this way, Riley and Emma in the case of a small quarrel, lasted two years of love relationship, in 2016 Riley graduated from high school into a nearby university, because Emma high school has not yet graduated, so the two are not in the same place, but Riley's university is not too far, and Emma's high school is only 40 kilometers away, and it only takes half an hour to drive. Even so, Emma's parents felt relieved that their daughter could finally break up with Riley. Emma's parents forbade Her to leave the house unless there was an activity at school or something needed to go out. But Emma's parents still failed to stop the relationship between the two, Riley and Emma still use their mobile phones to keep in touch, and Emma sometimes sneaks out to date Riley, Emma's parents have no choice. One day Emma accidentally saw a close photo of Riley with a strange woman, Emma was so angry that she finally couldn't bear the pain and decided to break up with Riley. After Emma proposed a breakup to Riley, Riley drank a lot of alcohol that night and was admitted to the hospital. However, no one would have thought that emma would suffer misfortune not long after the two broke up. On Sunday, November 20, 2016, after Emma and Riley broke up, Emma's parents were very happy, Emma's father took Emma to eat ice cream with him, and when she returned home in the evening, the family sat in front of the TV and watched TV, during which they laughed, and the previous unhappiness between Emma and her parents had dissipated. Since it was Sunday, the next monday school had to go to class, and Emma asked her mother to wake her up at 6 a.m. the next morning before going to bed. At 3 a.m., Emma's father, who was asleep, was awakened by two loud knocks on the door, he got up and went to the gate, found that the door was still fine, not damaged, opened the door and looked to the left and right, and found no one. To ensure safety, he also went to his daughter Emma's room to check on the situation, and he saw Emma lying quietly on the bed. Emma's father felt a little strange, but he didn't think much of it, and then went to sleep. At 6:15 a.m., Emma's mother shouted loudly for Emma to get up, but there was no response, and at 6:15, Emma's mother felt that Emma would be late if she didn't get up again, so she went to Emma's bedroom and found Emma lying motionless on the bed, seemingly still sleeping, and the mother came forward to check, only to find that Emma had no vital signs, and then the panicked mother called the police. When the police arrived at Emma's house, the surveyors found a bullet hole in the wall of Emma's bedroom, which was located right next to Emma's pillow, and then the surveyors found a second bullet hole on the other side of the bedroom, which was the same size as the first bullet hole, which meant that they may have come from the same gun, and the surveyor found two 9 mm bullet casings in the courtyard. There was a small wound behind Emma's left ear, where the bullet hit the place, killing Emma, and since there was not much blood, Emma's father did not notice an abnormality at 3 a.m. The police comprehensively judged that emma was lying on the bed that night, the murderer stood in the backyard of Emma's house, using a 9 mm pistol, fired a shot at Emma's bedroom, and then the murderer changed an angle and fired another shot at the same position, one of which went through the wall and hit the back of Emma's left ear, and the other bullet went through the wall and hit Emma's pillow. The two noises that Emma's father heard that night were not knocks on the door but gunshots. The police determined that the case was a murder and the investigation was officially launched. Investigators questioned Emma's friends to find out what Emma had done recently and who she had come into contact with. Emma's friends said that there were indeed several strange things that happened in the days before Emma was killed, that is, on the Friday two days before Emma's murder, the school's team won a game here, and to celebrate the victory, they held a party in the evening, Emma participated in the event as a cheerleader, and at 11:30 that night, Emma's mobile phone suddenly received a strange text message: "Take the car keys, go to the car, go alone, I have someone you care about, if you don't cooperate, I'll hurt him, he's in our hands, and if you don't want to care about him anymore, then you don't have to do anything, if you call the police he's dead, if you want to hear his last voice call me." A moment later Emma received a strange phone call, and Riley's cry for help was faintly heard on the phone, and it didn't take long for the phone to hang up. Then Emma received another text message: "He's in the canal next to the house, and it's a pity that you suddenly don't value someone's life." After receiving the text message, Emma and a few friends rush to check the situation, they do find Riley in a nearby ditch, Emma and friends ask Riley what happened, Riley said that he did not know what happened, only that someone threw him here, emma did not believe Riley's words at the time, she felt that it was just a prank by Riley, she told Riley that they had broken up and should not come back to her in the future. The next Saturday day, during the day, another strange thing happened, around 10:15 a.m., Emma was alone in the house, she suddenly found a man dressed in black outside the door frantically ringing the doorbell of her house, she was suddenly frightened, for a moment overwhelmed, she sent a text message to friends and family, including Riley. Her text message to Riley read: "I'm shaking and crying, I hate you, but I need you now". Riley immediately replied, "I'm here, I'll come, give me some time", riley quickly rushed to Emma's house, but by this time the man in black was gone. Emma thanked Riley for coming and chatted with him at the door. Emma's mother also rushed home quickly after receiving the text message for help, she saw her daughter chatting with Riley again, she was very unhappy, the mother immediately walked over, Riley quickly left. After the police grasped the above situation, they began to try to find nearby surveillance video to confirm the identity of the suspicious man. Fortunately, the suspicious man appeared in the surveillance of the neighbor's house, the man was dressed in black and walked alone from the road, but unfortunately the angle of the surveillance only captured the side of the man in black, not his front, and the surveillance screen was not very clear, and the police could not determine the identity of the man according to the clues. The police found that these two strange incidents were more or less related to Riley, so they called Riley to assist in the investigation, and at the police station, Riley took the initiative to tell the police about his abduction. The police then ask Riley about his movements during that time, and Riley says that he left the college dormitory that night, and because Emma blocked his phone number, Riley contacted Emma by a friend's phone, at which point Emma did not agree to Riley's request to see her. Riley drove to his grandfather's house, he arrived at his grandfather's house at about 00:45 a.m., Riley stayed at his grandfather's house for 45 minutes and left, Riley said he was very sad, when he left his grandfather's house in the early morning, sat in the car and cried for two hours, and then went back to the university dormitory. Investigators received favorable information that the day before Emma's murder, someone reported that his gun had been stolen, and that the reporter was none other than Riley's grandfather, and that it was a 9mm pistol, which was the same caliber as the gun that killed Emma, which had to make the police highly suspicious of Riley. Riley's college roommate told police that Riley returned to the dorm around 4:45 a.m. that night, and from the point of time, riley was basically the only one before returning to the dormitory. The police then received a whistleblowing call from two of Riley's friends, Noah and Alex, who told the police that after the incident, Riley once asked them a question: how to remove the fingerprints from the pistol. But Riley told them the case had nothing to do with him, but he had a gun in his hand and he wanted to get rid of it. When the police learned of the situation, they could basically confirm that Emma's killer was Riley. In order not to scare the snake, the police can not immediately carry out the arrest operation, because they do not have enough evidence, if you can find the gun used for the crime, then you can prosecute him, Riley's two friends Noah and Alex showed the police that they are willing to assist the police, so the operation against Riley began, the second night after Emma's murder, Noah and Alex asked Riley to go to Noah's house to play games, the three sat on the couch and played video games, slowly Noah and Alex began to ask Riley some questions, Riley wasn't much defensive, and he would never have imagined that a hidden camera was secretly recording everything. Riley still said that he owned a gun, but he would never give it to the police, but wanted to dispose of it as soon as possible, Noah and Alex said they could help with the matter, Riley thought it was a good idea, he said that he hid the gun in the basement of his grandfather's house and needed to go over and get it, and then the three of them drove to Riley's grandfather's house, where Riley refused to let two friends accompany him, but entered his grandfather's house by himself, and when he came out, he had a plastic bag in his hand. Then they drove away, noah secretly sent a text message to the police in the car, and the police car quietly followed them. The three drove to the river, riley wearing white gloves, took out the gun, and the police who had been following them from afar suddenly appeared and arrested Riley. In Riley's car, the police also found a black dress, similar to the dress of the man in black who appeared in front of Emma's house. It was confirmed that the man in black who appeared in front of Emma's house that day and frantically rang the doorbell was Riley, all of which he directed and acted, including the so-called kidnapping. In January 2017, the police indicted Riley for first-degree murder and six other criminal counts, riley's lawyer in court defended by manslaughter, saying that Riley was unintentional, he just wanted to scare Emma, his purpose was only to hope that Emma could return to his side, but did not expect to miscalculate the position, accidentally killed her, the prosecution believes that Riley has been to Emma's house many times, he clearly knows the exact location of Emma's bed, the target of the shooting is obviously toward Emma, the jury reached an agreement after consultation, The court convicted Riley of first-degree murder and sentenced him to life imprisonment without parole for 51 years. The young Emma was unfortunate, she had dreamed of becoming a neonatal nurse, this dream was shattered, in her honor, a ward in a local children's hospital named after Emma, in this way to complete Emma's dream.