Immediately after the incident, the police conducted an investigation into the victim's whereabouts that night.

Campus surveillance records show that the victim, Xin Yuan, came out of the No. 2 complex building at around 22:10 p.m. on May 29, 2016, walked along several main campus roads to the vicinity of the stadium, and then disappeared from the surveillance footage until the body was found and never seen again.

Judging from the time of the crime and the victim's call records, Xin Yuan should have gone to meet people near the stadium after finishing her evening self-study in the complex building. The last call message shows that the person who called Xin Yuan at 21:37 that night is called Lin Chang, and after investigation, the boy is a junior student majoring in computer science at R City Normal University, and he is a classmate and friend with the victim's ex-boyfriend Zhang Chao, and the relationship with the victim is also relatively familiar.

When reviewing the surveillance footage, the police also noticed that not long after Xin Yuan came out of the complex, a young man wearing a hoodie and carrying a schoolbag on one shoulder followed Xin Yuan all the way to the vicinity of the stadium. Since then, he has disappeared from the surveillance footage and has not been seen again like the victim.

Because the stalker was wearing a hat and deliberately avoiding the camera, the police could not see the man's appearance, but his physical characteristics matched the suspicious man that Mr. Qin witnessed near the family area. The police deduced that the stalker may be the murderer of Xin Yuan, and the police have not been able to confirm whether this person is Lin Chang, who called Xin Yuan, or someone else.

Judging from the current situation, Lin Chang is undoubtedly suspected of committing a crime, and the victim's ex-boyfriend Zhang Chao was also included in the investigation by the police. (Surveillance footage shows that Zhang Chao was seen near the stadium at around 10:40 p.m., and appeared agitated and irritated, suspecting that he had met with the victim and had an altercation.) ）

Three homicides, three victims of different ages and different life backgrounds, what are the criteria for the murderer to choose the victim? What was his motive for committing the crime? Is it a vendetta for the purpose of revenge on the individual? Or is it "indiscriminate killing" for the purpose of revenge on society?

If it is the former, the police still need to find common ground from several victims and find out the intersection information. But if it's the latter, looking for a psychopathic murderer among tens of thousands of students on a huge campus is simply looking for a needle in a haystack.

Perhaps with the help of psychological portraits, they can get a list of suspects that match the characteristics of the crime, but it will take some time to sort out this list, and this list must contain the names of many people, and investigating them one by one will extend the time limit for solving the case. In this way, the murderer is likely to start killing again during this period, and the beautiful college campus will not become his murderous paradise?

was busy until more than 5 o'clock in the morning, and Fan Cong finally had time to chat with Gu Song about things other than the case. As soon as he remembered Ruonan's "intimate behavior" of bumping into them at the stadium and misunderstanding the relationship between them, Fan Cong became angry. He sat on the sofa in the office, smoking a cigarette depressedly, while looking at Gu Song with a scrutinizing gaze and asked, "You tell me the truth, what did you do last night?" ”

Gu Song was a little impatient, remembering that he was impulsive and almost regarded Xiao Yun as a substitute for Tian Rui, and he was very embarrassed in his heart. "Can you please stop mentioning that? Am I going to look for for one night? ”

"You don't come." Fan Cong pursed his lips and expressed disbelief. "I've known you for years, and I know you're not that kind of person. Are you looking for a girlfriend again? ”

"Haha, girlfriend?" Gu Song laughed exaggeratedly a few times, as if he had heard some ridiculous joke. "Do you think I'm going to find a girlfriend after all that's happened? My life may not be good, girls will be unlucky when they are with me, so why should I hurt others again. ”

"Then you can't be a bachelor for the rest of your life, right?" Fan Cong joked half-jokingly, but Gu Song showed an extremely serious expression and said, "Unless I don't do such a dangerous job anymore, it's not impossible to be a bachelor for the rest of my life." ”

"According to you, our brothers don't have to find girlfriends."

"Not really." Gu Song smiled bitterly, "After all, not every policeman can encounter so many perverts in his work, and not every pervert will be so persistent in a policeman." But I just have this kind of attraction and perverted quality, and there are some things that I can't escape. ”

"But if Nurse Tian recovers her memory, aren't you going to get back together with her?"

Gu Song waved his hand again and again, "Don't talk about this yet." Then he changed the topic and said, "You went to Long Simiao's father yesterday and asked for any valuable information?" ”

"I was about to tell you." Fan Cong suddenly remembered something, "I went to the hospital to inquire, and on the morning of May 27, Long Simiao had already helped his father go through the discharge procedures. That uncle's illness was obviously not cured, and Long Simiao borrowed so many loan sharks, definitely wanting his father to receive a kidney transplant. Since they couldn't wait for a suitable kidney source through formal channels, it is estimated that they contacted the organ trafficker in private. ”

"Eh, if we can find those organ dealers, we might be able to inquire about Jia Nan's situation by the way."

"I think so too. However, I have not yet found their foothold. Long Simiao couldn't be contacted for the time being, and I didn't find him when I went to his residence. ”

"Have you ever been looking for Qiye? He should know where Long Simiao's father and son are, right? ”

"I asked, and he said that he didn't know that Uncle Long had been discharged from the hospital, and Long Simiao hadn't contacted him in the past few days."

"He's lying, isn't he?" Gu Song frowned and said, "It's impossible for him not to know about such a big matter." He must have been afraid that we would hold them accountable for their involvement in the illegal organ trade, and he deliberately hid it from us. ”

"It's okay." Fan Cong didn't really care about this problem, "Go back and find someone to follow Qi Ye secretly, and you will soon know where they are and what they are doing." ”

At around 8 o'clock in the morning, Zhang Chao, the ex-boyfriend of the victim Xin Yuan, and Lin Chang, a friend of Zhang Chao, were taken to the criminal police team and questioned by the police respectively.

According to Zhang Chao's own account, the real situation last night was actually like this:

Zhang Chao and Xin Yuan met under the introduction of Lin Chang, a cadre of the student union, and became boyfriend and girlfriend. The two began to fall in love at Christmas in 2015, although there was no big conflict during the relationship, but because Zhang Chao likes to play online games, he always neglects to take care of and accompany Xin Yuan, and on the night of April 12, Xin Yuan took the initiative to break up with Zhang Chao.

After the breakup, Zhang Chao wanted to change his living habits and hoped that Xin Yuan could give him a chance to reform himself. But after pleading many times, Xin Yuan refused to accept his apology, and did not believe that he could really quit his addiction to playing games. In the end, Xin Yuan directly dragged him to the blacklist, so that he didn't even have a chance to express his determination and apologize.

In desperation, Zhang Chao had no choice but to ask his good friend Lin Chang for help. So last night, Lin Chang took the initiative to call Xin Yuan and asked her to meet at the stadium, saying that he wanted to talk about something, but in fact, the person who went to the stadium to make an appointment was Zhang Chao.

In order to save face for her friends, Xin Yuan went to the stadium alone after evening self-study, but she didn't expect to meet her ex-boyfriend Zhang Chao in the stadium.

Taking this opportunity, Zhang Chao finally had the opportunity to have a good chat with Xin Yuan. At the beginning, the two talked about each other's recent situation, and the atmosphere was quite harmonious. However, when it came to the matter of reunion, Xin Yuan once again showed an attitude of refusal. Maybe it was to make Zhang Chao completely dead, Xin Yuan said that the person she really liked was actually Lin Chang, otherwise she wouldn't have run to the stadium in the middle of the night to make an appointment.

Zhang Chao was very angry at that time, jealous, and said a lot of ugly things to Xin Yuan. The meeting between the two broke up unhappily, and Zhang Chao left the stadium angrily, leaving Xin Yuan there alone. He didn't know what happened next.

Knowing that Xin Yuan was brutally murdered by a serial murderer shortly after he left, Zhang Chao was heartbroken and repented for not being at the beginning. If it weren't for his stubborn fighting, asking the other party to get back together with him, if it weren't for his impulsiveness, taking the girl's angry words seriously, and leaving the stadium alone, Xin Yuan would not have been attacked by demons.

Mr. Zhang said he didn't notice any suspicious people near them during the conversation because his attention was all on his ex-girlfriend.

The police conducted a detailed inspection of Zhang Chao's personal belongings and found no murder weapon, but judging from the current situation, the possibility that he killed people out of love cannot be completely ruled out.

In another interrogation room, Lin Changgang explained similar things to Gu Song and Fan Cong. He said that he hadn't been to the stadium at all last night, and just called to help Zhang Chao create an opportunity to meet, and he didn't expect that the two people would be unhappy because of themselves, let alone that someone secretly followed Xin Yuan.

Lin Chang said that he didn't believe that Zhang Chao would be the murderer of Xin Yuan, and asked Gu Song rhetorically, "Even if Zhang Chao has the time and motivation to kill Xin Yuan, but the first two cases have nothing to do with him, and it seems that Zhang Chao is the murderer just because the two of them have had emotional entanglements, this conclusion doesn't seem to be convincing." ”

Gu Song had seen Lin Chang a long time ago, when Qi Ye was still a resident singer in the Valley of Stars, Lin Chang came to the bar to make a scene, but the other party didn't recognize his identity.

He looked thoughtfully at Lin Chang's face that was full of anger, shock, sadness and doubt, and asked solemnly, "Where were you between 10 and 10:30 last night?" What are you doing? ”

Hearing these two questions, Lin Chang's face suddenly changed, as if he had been greatly insulted. "Officer Gu, what do you mean by this?"

Gu Song looked at him intently, "Please answer my question." ”

"I'm reading a book alone in my dorm room."

"Can anyone prove it?"

"Nope." Lin Chang reluctantly spit out two words. "Zhang Chao was in a bad mood, he returned to the dormitory very late, and we had a big fight over the question of who Xin Yuan liked."

"That means that when Xin Yuan was killed, you didn't have an alibi."

"Yes." Lin Chang frowned unhappily, "But you can check the surveillance video downstairs in the dormitory, I haven't come out since I returned to the dormitory at 9 o'clock, until I was taken to the criminal police team by you this morning." ”