During this year, Lu Wan had read too many domestic case files while studying in Kyoto. Although she had no personal experience, the people who reported the cases were the investigators at the time, and they made detailed classifications of various murder cases.
In recent years, criminal psychology has become very popular in China, and almost every city bureau has a person who specializes in criminal psychology.
The current popular criminal psychology comes from abroad. The so-called criminal psychology is, to put it bluntly, a summary of various cases.
Foreign criminal psychology is a theory compiled based on perennial cases in certain foreign countries. Their exchange and study is to compile a set of criminal psychology that is suitable for China.
The so-called criminal psychology is not as magical as the world imagines. To use the most popular words nowadays to describe it, it is just big data.
Of course, some people can use the same big data well, while others cannot. Just like a doctor treating a patient, two doctors with the same education may have different treatment methods and results.
Lu Wan did not explain too much. She knew that it would be difficult to convince everyone based on the current clues alone.
"Let's talk about the autopsy first!" Lu Wan sat aside.
Qin Youwei projected the autopsy report, "The deceased's name was Tang Xueqiong, female, 24 years old. The cause of death was mechanical asphyxia. The murder weapon was a towel found at the scene. There were many wounds on the deceased, mostly on the chest, abdomen, face, and also on the limbs. Some of them were all caused during life.”
"The most serious injury was in the abdomen, causing internal bleeding. The injuries caused by these heavy blows alone almost killed half of the deceased's life. It has been determined that the deceased was violated before his death. No male hair or body fluids were found in the bathroom."
"Where is the bed in the master bedroom?" Lu Wan suddenly asked.
Qin Youwei paused and shook his head, "No."
Lu Wan frowned, "When we questioned the reporter, we got a clue that the deceased had a boyfriend who would occasionally come to the deceased's house to spend the night with her."
Zeng Hao echoed, "It stands to reason that the deceased should have her boyfriend's biological information on her bed. Of course, it does not rule out that the deceased paid more attention to hygiene and happened to have just changed the sheets."
Lu Wan picked up the photos taken by the forensic doctor at the scene and asked in a low voice: "There are no signs of binding of the deceased's hands and feet. Was the deceased's mouth gagged?"
Qin Youwei thought for a while and said: "It is certain that the murderer did not seal the deceased's mouth with tape or anything like that. There was no foreign matter left in the deceased's mouth. I don't think the murderer used anything else to seal the deceased's mouth."
"How strange! The deceased is fully capable of calling for help, right?" Zeng Haohe glanced at Bai Mo, "Bai Mo and I visited the surrounding people in the morning, and no one heard any cry for help last night."
Lu Wan analyzed: "The murderer probably beat the deceased so that she lost the ability to call for help." Lu Wan looked at Qin Youwei, "There should be many lacerations on the head of the deceased, right?"
Qin Youwei nodded.
Lu Wan said: "This also shows that the murderer has experience in committing crimes. In general home invasion crimes, the deceased will definitely be controlled by tying them up. But the murderer did not! It can be seen that he is very confident in his own strength and is convinced that just by beating the deceased It will make them lose the ability to call for help."
After saying that, Lu Wan stood up, "The deceased was not hit hard on the back of the head, which means the murderer never considered knocking the deceased unconscious. He was enjoying the pleasure of conquering the deceased with violence, which is a typical morbid psychology."
Bai Yonghui, who had been silent, nodded. He was almost convinced by Lu Wan.
At first, Bai Yonghui believed Lu Wan's judgment, which was based on his trust in Lu Wan, but all inferences require evidence, and he is not a person who is subjective above all else.
The discussion has progressed so far. Bai Yonghui can admit that the murderer has criminal experience, but he still needs evidence to confirm that the murderer is a serial killer.
In fact, the word serial killer is very vague in Bai Yonghui's dictionary. In his era, evidence and logical reasoning based on evidence were important. This was a traditional method of criminal investigation and case handling.
In recent years, Bai Yonghui has also been trying to accept the magical psychology of criminality and has read many books. However, given his age, it is difficult for him to fully accept many concepts.
While thinking, Bai Yonghui glanced at Bai Mo, who seemed to have all his attention on the screen.
"How was the investigation of the deceased's social relations?" Lu Wan asked Sun Xiaokai.
Sun Xiaokai shrugged, "The deceased is a foreigner. He came to Meihai City to work half a year ago and worked as a data clerk in a clothing company. The interpersonal relationship is very simple. The deceased's boyfriend is Song Jingliang, who works in a foreign trade company and has been on a business trip in the past two days. , her parents are in their hometown and they don’t have any enemies, I have already informed them.”
Lu Wan smiled at Chen Xiaoxiao, "Xiaoxiao, what do you think?"
When Lu Wan suddenly called her by name, Chen Xiaoxiao forced out a smile, looking coy.
"Speak boldly." Lu Wan encouraged, "You graduated from the Public Security University. Although experience in handling cases is important, theoretical knowledge can sometimes also play a role."
Lu Wan remembered clearly that at the crime scene today, Chen Xiaoxiao was the only one who thought about the serial killer.
Chen Xiaoxiao took a deep breath, stood up and said, "I think what Lu Jun said is particularly consistent with the psychological characteristics of the murderer. The murderer enjoys the pleasure of conquering the dead with violence. In other words, the murderer advocates violence. The murderer dares to do this in Tongzilou, Xiacheng District. He was not afraid of being discovered by his neighbors when he committed the crime, which shows that he was familiar with the structure there and had an escape route before committing the crime. So I think..."
Seeing that Chen Xiaoxiao was speechless, Lu Wan continued her words: "The murderer is very confident and has a strong desire to control."
Lu Wan explained to everyone: "The murderer knows how to clean up traces, which shows that he is cautious in doing things, but he dares to follow the deceased on the street and commit crimes directly in the building. What I see is not his impulsiveness, but his ability to control the overall situation." Confidence. The murderer’s violent method of controlling the deceased from asking for help is also a reflection of his confidence. He is confident that he can control everything about the deceased!”
"Combining these profiles, we can get some characteristics of the murderer." Lu Wan said, "The murderer is a male, between 20 and 30 years old. He suffered violence as a child, which may be domestic violence or external bullying. Life. In Xiacheng District, he was familiar with the streets in the Tongzilou area and his economic conditions were very poor, so he had to search for the deceased's belongings after committing the crime."
Lu Wan tapped her fingers on the table a few times, and then continued: "The deceased should have dropped out of school very early. His violent tendencies prevented him from having a stable job. He might have been a street gangster who liked to wander the streets. "
As he spoke, Lu Wan's voice became smaller and smaller, and everyone could barely hear Lu Wan's whisper, "Serial killer... but no similar cases have occurred..."
Lu Wan stood up suddenly, with a hint of shock on his face, "The first case may have happened at his home, and the victim was someone close to him, someone of a similar age, his girlfriend, sister or younger sister!"
