Criminal Investigation Chronicle

At 11 a.m. on November 4, the police station received a report that a sanitation worker found a dead body while cleaning in the early morning.The deceased was a workshop worker who looked to be in his thirties. He was wearing overalls from a certain factory and his chest was dyed red.Lying on a small road, not far from the victim's factory.After investigation, the deceased Du Yu, 5 years old, was a workshop worker in a factory not far away. He got off work at 31 am on the 3rd and lived in a turnover room a few miles away from the factory. The traces of the victim's struggle are also not obvious. The chest was pierced by a sharp knife and killed with a single knife. The time of death was between 2:3 and 2:2 in the morning on the 2rd. The record was a phone call with his lover at 10:[-] p.m. on the [-]nd. There were no obvious clues left at the scene. The road surface was concrete, and no valuable footprints were left.When Zhao Lei arrived at the scene, the site survey had been completed. Zhao Lei lit a cigarette, took a deep breath, and turned to look at Lin Chong. "Brother Zhao, join the case. I think it's the same person." Indeed, the timing and modus operandi are very similar.After further understanding of the situation, I learned that because Du Yu was married, he lived in a turnover room not far from the factory. The workers who got off work with Du Yu on the same day were all single and lived in the collective dormitory in the factory. After work, I went back alone, as several co-workers can attest.

After Du Yu's wife arrived, she collapsed and cried into tears. The criminal police persuaded her for a long time before she calmed down. After questioning, it was learned that Du Yu talked to his wife for the last time at 2:10 p.m. on the 2nd. At that time, Du Yu had nothing unusual , let his wife go to bed early, and he went home after work at 2 o'clock in the morning. Judging from the distance, Du Yu should be able to get home at 5 o'clock, but his wife was also tired. After all, it wasn't until the sanitation workers cleaned up at [-] o'clock in the morning that they found Du Yu who had been dead for a long time.

After investigation, Du Yu is a very ordinary worker, a foreigner. He has worked in a certain factory in Yanjing for six or seven years. Wife, the shift in the factory is three shifts, working 8 hours a day, changing shifts once a week.I have been married for more than a year and have no children. My wife is a classmate in my hometown and is now working as a shopping guide in a supermarket in Yanjing.Judging from his identity, background, and interpersonal relationship, Du Yu is nothing special, even ordinary, and he has no grudges with anyone.But there is one thing that is very special. Du Yu's wife lost her mobile phone not long after talking with Du Yu. Du Yu's wife was also called by the worker who went to Du Yu's home to notify her.

"Why did you lose your phone?" Zhao Lei asked immediately as if he had caught something.

"I don't know either. I fell asleep after the phone call. I seemed to hear something in a daze. I didn't care. Just now my colleague Du Yu called me. I wanted to check the time. The phone is gone."

Zhao Lei quickly dialed Du Yu's wife's phone number, indicating that the phone had been shut down.Zhao Lei took people to Du Yu's house. Du Yu's house is a very simple turnover room, one bedroom, one living room, one kitchen and one bathroom. It is on the second floor, but there are no security windows. When he was asleep, he entered the room through the window, took away the mobile phone, and killed Du Yu when Du Yu came back.Through comparison, several footprints were indeed found near the window, which matched the footprints found at the back door of Li Jun's case bar.

"Brother Lin, what do you think?" Zhao Lei used to ask Lin Chong for his opinion every time he encountered a case, and this time was no exception. Zhao Lei came to the police academy at noon.

Lin Chong had just finished class, looked at the two files carefully, and after a while, said, "Brother Zhao, I suspect this is a serial indiscriminate murder case. From Li Jun to Du Yu, the two have different lives, experiences, jobs, and ages. , if you have to find something in common, it is that both of them are men, and there is no reason for them to be killed. In a relatively remote factory, the two cases were committed only one day apart. They were both committed in the early morning, and the techniques were the same. If you look at the medical appraisal results, it shows that the same murder weapon was committed. The force and angle are very close. It should be committed by one person. Moreover, the choice of Du Yu to commit the crime should not be a temporary idea. He must have been observing for a long time. After he successfully killed Li Jun, he would kill Du Yu the next day. The time is too tight, and the success rate will be greatly reduced. Moreover, the murderer stole the mobile phone of the victim's lover or someone close to him twice, which is very puzzling."

Zhao Lei: "We will continue to investigate. If we can find similarities between the two, we may be able to understand the motive of the murderer. But right now, there is too little useful information, and I haven't found anything special. But I think the murderer is very likely Will commit murder again. Let’s speculate on the murderer’s information.”

"According to the footprints left by the murderer at the back door of the bar, the murderer is between 1.7 meters and 1.8 meters tall, weighing 65 to 70 kilograms, and has a strong and powerful figure. The two victims are all adult males, and they will kill with one blow. Li Jun drank a lot of alcohol at the time, but Du Yu was killed in a very sober state, which means that the murderer was very skilled, and he may have received professional training, and he was very good at handling cold weapons such as knives. From this point of view, we I think the army, the police, or people who practiced martial arts since childhood should be given priority. On the other hand, Du Yu's factory is nearly [-] kilometers away from the urban area. The murderer should have transportation to observe Du Yu's living habits and crimes. As for other information, I haven't thought of it yet." Lin Chong shook his head, saying that there was too little evidence to make further reasoning.

"You go ahead, I'll go back to the police station." After bidding farewell to Lin Chong, Zhao Lei returned to the police station.On the way, Zhao Lei's cell phone rang, and it turned out to be a text message, which only had one number: 30.It came from an unfamiliar number. Zhao Lei called the number, but it reminded the other party that the phone had been turned off.