There are many factors that make Sun Yu think of it.

For example, the question Xia Lan asked before, if the murderer's target was a student admitted to the medical major, how did he know that the other person was admitted?

Sun Yu had already identified Wu Chengan as the murderer at that time, so he deduced based on the results that Wu Chengan and Jia Yuanyuan were both gangsters in society, so there was naturally some overlap.

After discovering that Wu Chengan had no time to commit the crime today, Sun Yu reflected on it. He had to admit that his thinking became narrowed after it was confirmed that Wu Chengan was the murderer.

Ten years ago, getting admitted to a junior college was not something worth showing off at all.

A bad girl like Jia Yuanyuan who often bullies others must have a very strong self-esteem. How could she take the initiative to show off this matter? There is another type of person who knows what school Jia Yuanyuan went to, and that is her classmates.

The two murder cases in the park involved moving the deceased, so everyone had a default premise - the murderer was male.

Today, after seeing the situation in the family building, Sun Yu saw the possibility that the murderer was a woman. Coupled with those strange phenomena, Sun Yu began to try to find the female murderer.

So he looked at Jia Yuanyuan's graduation photo, and sure enough, he found Liu Jie in it, the woman who had appeared in the Galway Hotel.

After finding Liu Jie, Sun Yu felt that everything could be explained.

"The murderer was Liu Jie, so how did she move Gao Wei to the grass in the park?" Cao Qin didn't fully understand what Sun Yu meant, so she smacked her lips again, "But she didn't seem to have time to kill Jia Yuanyuan!

"

"What if there is another Wu Cheng'an?" Sun Yu asked rhetorically.

"Are there two murderers?" Cao Qin frowned. Although she had solved numerous cases in Yangbai County over the years, she had never encountered many serial killers. "Is there any evidence?"

"The autopsy report will be the basis later." Sun Yu said, "Of course, before the autopsy report comes out, I suggest you check Jia Yuanyuan's mother. She should be divorced and disappeared sixteen years ago."

Cao Qin stared at Sun Yu in silence for a few seconds. Sun Yu's confident expression was as if the murderer had been brought to court.

After nodding, Cao Qin came to the computer for checking household registration. She didn't ask anyone to help because she wanted to witness Sun Yu's prophecy in person.

Cao Qin is not a fool. She is very familiar with this time sixteen years ago. That was the time when Wu Xiaohu had an accident. At that time, there was an unknown female deceased in the car.

Sun Yu's meaning was very clear. The deceased woman should be Jia Yuanyuan's mother.

The police's information technology has developed very comprehensively in recent years, and data from all places are connected to the Internet. In less than an hour, Cao Qin found Liu Jie's mother, Liu Lingzhi.

Exactly as Sun Yu predicted, Liu Lingzhi divorced when Liu Jie was 3 years old, and has been raising her daughter alone since then.

The last trace of Liu Jie's ID card was that she bought a train ticket to Dongyan City, eighteen years ago, and there is no trace after that.

Could it be...

Cao Qin clicked on Liu Lingzhi's school status file. She had attended a medical school, which also proved that she had attended high school.

Cao Qin looked at Sun Yu in front of the whiteboard with a look of surprise. Just as she was about to say something, Forensic Doctor Wang opened the door of the office and hurried in.

The appearance of Forensic Doctor Wang attracted the attention of everyone in the office. He came straight to Sun Yu and was out of breath because he was walking too fast.

After breathing for a few minutes, Forensic Doctor Wang said: "It has been confirmed that the knife used to cut open the deceased was the same knife used ten years ago. There was a very fine blood groove on it, which was exactly the same.

The composition of the anesthetic in the deceased’s body is exactly the same as that of the deceased in the park, and the cosmetics you mentioned, the makeup on the deceased’s face did not come from the cosmetics at her home, it is indeed consistent with that in the park murder case.”

What everyone didn't know was that Sun Yu had told forensic doctor Wang the answers to these three questions before leaving the scene of the crime.

When forensic doctor Wang discovered that every answer given by Sun Yu was consistent with the facts, he was really shocked by Sun Yu.

Sun Yu spread his hands and shrugged, "Do you still need to explain?"

"Need it!" a police officer raised his hand and said.

Sun Yu pursed his lips towards Xia Lan. In his opinion, these evidences were equivalent to putting food on his lips.

Xia Lan curled her lips and turned slightly, obviously not wanting to eat the mouthful of food that Sun Yu brought to her mouth.

Sun Yu laughed twice, "The murderer is deliberately telling us that Wu Chengan is not the murderer, just like the speculation at the scene, just to clear Wu Chengan's charges.

We raised an objection at the scene. If it was to clear Wu Chengan's suspicion, why did the murderer bother to put on makeup? There is a conventional thinking that misled us..."

The knife from ten years ago was the murderer's weapon, but the murderer may not know that the police have advanced enough technology to determine that the murder weapon used to kill the pregnant woman was the knife from ten years ago.

Therefore, in the murderer's mind, if she wants to prove that the death of the pregnant woman is related to the previous case, she needs to show evidence that the police can add to the case.

The special features of the park murder case include wedding suits, makeup, cyanide, and drugs.

In fact, drug use can prove that the two cases were committed by the same murderer. However, in order to be more safe, the murderer put makeup on the deceased to look more attractive, using the same cosmetics she used when she killed someone in the park.

It's a pity that the murderer ignored one issue. It is impossible for pregnant women to wear heavy makeup for the sake of their fetus, and even light makeup must be cosmetics specially designed for pregnant women.

This series of unnecessary actions prove that the murderer just wanted to prove that he was the murderer, and Wu Chengan, who was imprisoned in the Public Security Bureau, was not!

"Two murderers! Killing together!" Cao Qin took a breath.

"No, no, no!" Sun Yu shook his finger, "It's not killing together, it's killing alternately!"

Sun Yu circled Jia Yuanyuan's name on the whiteboard, "There were flaws in the deceased's makeup. It was completely different from the deceased woman in a wedding dress in the park. It can be seen that Liu Jie was not good at makeup, so she chose to put makeup on the deceased.

In her mind, she was imitating Wu Chengan's killing method, so it was Wu Chengan who was good at putting on makeup. After all, human traffickers are really good at putting makeup on their trafficked victims."

Ma Youran was the first to realize what Sun Yu meant. She nodded and said thoughtfully: "Liu Jie hated his stepfather, so Liu Jie killed all the male victims. Wu Chengan hated his stepmother, so he only killed

female."

"But..." Ma Youran shook her head again, "The female deceased symbolizes Liu Jie's mother. Why did she treat the deceased so cruelly?"
Chapter completed!