The confirmed portraits of the murderer are:

1. A male outsider (probably from Shenzhen, Guangdong Province);

2. A stolen bicycle;

3. A stolen baby thermos.

After Chen Guangyao used Fang Zhenyue's mobile phone to call the office, he turned around and confirmed the suspected murderer's hair with Jiayi and Fang Sir:

"7cm long hair, rough hair, stained with dust and other impurities. DNA testing will take a long time, but the current information is consistent with the information provided by the New Territories North Forensic Division before - it can be basically confirmed that it is the murderer's hair."

"In other words, the murderer is most likely a male with short hair 7cm long." Fang Zhenyue nodded.

"Yes, there are a few white hairs in the short hair found at the scene. If it is not premature graying, it should be someone of some age." Chen Guangyao added again.

"I'll call Mr. Xu." Jiayi suddenly said.

"?" Chen Guangyao raised his eyebrows, not understanding why he suddenly called the medical examiner Xu Junhao.

"?" Fang Zhenyue also cast a puzzled look.

After the phone rang a few times, the other party answered.

As soon as he heard Jiayi's voice, Xu Junhao immediately said with a smile: "Jiayi, what's up? What's up?"

Xu Junhao's friendliness was completely in vain. Jiayi didn't even say hello to him and got straight to the point about work:

"Mr. Xu, can we determine the age of the murderer through the autopsy?"

As soon as she asked this question, not only was Xu Junhao on the opposite side stunned, but even Da Guangming and Fang Zhenyue standing beside her raised their eyebrows in surprise.

Xu Junhao mentioned before that when the murderer killed people, the victims were lying down, and the murderer's height and other information could not be judged. How could the murderer's age be judged from the condition of the body?

Could it be judged by the murderer's skill in using a kitchen knife that he was an old chef? Or can we tell a person's age by the way he uses the hammer?

For example, the way an older person holds a hammer is different from the way a younger person holds a hammer?

Fang Zhenyue and Chen Guangyao's imaginations quickly flew to the sky. With curiosity and wild thoughts, they approached Jiayi and listened to Xu Junhao's answer on the other end of the phone:

"It can't be...right?"

Asked by Jiayi, the professional Sir Xu was unconfident again.

It was Jiayi who asked the question. As a forensic doctor, he couldn't make the judgment. Could it be that Jiayi could?

Da Guangming and Fang Zhenyue also had similar doubts. After looking at each other, they stared at Jiayi with expectation.

"I have an idea, but I don't know if it is scientifically valid. I would like to ask for your opinion." Jiayi continued.

"Well, you tell me." Xu Junhao's voice was completely devoid of any intimacy or other emotions, and he was just anxious to know what Jiayi was talking about.

"Although there may be exceptions between young and strong men, older men, and younger men, in general, the strength should be different, right?

"Is there any research that uses the extent of the victim's injuries to judge the strength of the murderer, and then infers the murderer's appearance, muscle condition... and even age range?" Jiayi asked.

"There is, but its range is very vague, and there may be many exceptions, so we rarely apply it to forensic medicine. It is too easy to mislead criminal investigation work." Xu Junhao judged.

"I understand this, let's discuss the normal situation, okay? "Based on the force of the murderer's hammer, what kind of person is he?" Jiayi asked.

"Well... the murderer's hammer was very powerful. Basically, as long as he aimed at the victim's head, he could kill the victim without the first blow. Based on the comparison of the injuries of the victims in the previous cases, I can conclude that the murderer knows more and more which part of the human head to hit with the hammer to be the most lethal. In other words, the murderer's killing method is improving, but in terms of age... he should be a young man. The strength of the elderly is reduced, and it is not only difficult for them to hit so deep with one hammer and shatter the skull to that extent... after all, the human skull is very hard.

"Ah... now that you mention it, I have some new ideas."

Xu Junhao suddenly said.

"Sir Xu, please tell me quickly." Jiayi's voice was full of joy as if she had found a treasure, which greatly encouraged Xu Junhao.

He hurriedly said, "An old man probably doesn't have the strength to kill five or six people in one night, not to mention raping the female victims many times after the murder."

Sex itself is also a very physically demanding behavior, especially when the woman does not cooperate.

All of this can prove that the murderer is most likely not an old man.

"If it's youth, it includes the two intervals of young people and middle-aged people, right? Men tend to develop later. Excluding some special cases of precocious prodigies, the murderer should be between 17 and... 50 years old. Does Sir Xu agree?" Jiayi asked.

"Yes, that should be the case." Xu Junhao thought about it seriously, and felt that this inference was 10% reasonable, so he agreed.

"OK, but just now Brother Da Guangming received a call from a colleague in the Forensic Department, saying that they had compared the hair found in multiple home annihilation cases other than the victims.

"Because the hair is of the same rough texture, does not belong to the victims, and is about 7cm long, it exists in every home annihilation case. It can basically be judged that this is the murderer's hair.

"Although the amount is not much, it is enough to draw some conclusions.

"The first is that the murderer is a male with hair about 7cm long, and the first is that there is a certain amount of white hair among these hairs.

"Then unless the murderer has premature gray hair, we can basically rule out the two categories of teenagers and young adults and judge that the murderer is a middle-aged man."

Jiayi spoke slowly, and it was obvious that she was sorting out her thoughts while she was talking.

Xu Junhao on the other side of the phone and Fang Zhenyue and Da Guangming beside Jiayi were all listening carefully. Da Guangming even took out a notebook and made some notes halfway through listening.

In response to Jiayi's speculation, he could make a better analysis file based on the "hair" evidence found at the scene. Jiayi's words gave him a lot of inspiration and made him more enthusiastic about his work. Every word and sentence flowed through the brain space as wide as eight lanes, and was quickly recorded in the notebook.

"Then at least we have to rule out many special cases. Premature gray hair is a bit common..." Xu Junhao said with some embarrassment.

"It's okay, Mr. Xu. We are not trying to draw a perfect portrait of the murderer. At this stage, we are not ready to draw a portrait of the murderer until it is 90% complete. The most important thing for us now is to piece together a visual portrait, publish an advertisement to catch the murderer, and warn the public at the same time.

"Then it will be enough as long as we can make it clear that the murderer looks like a middle-aged man around 40 years old.

"Even if he has premature graying of hair, as long as he has gray hair and has been traveling for so long, he will always look down and out, right? "

Jia Yi raised her cell phone to her ear. When she said this, her eyes sparkled like stars, and her whole body glowed with a different kind of brilliance.

Chen Guangyao and Fang Zhenyue were standing next to Jia Yi. Seeing her like this, they felt encouraged and their hearts were surging.

Without waiting for Jia Yi to hang up the phone and explain to him, Fang Zhenyue took out the cell phone from his pocket and took the initiative to call Inspector Guo of the Public Relations Department.

After introducing the feature of the murderer's 7cm short hair, he roughly estimated the murderer's appearance and age.

"So soon, there is new information. It's worthy of being the Serious Crime Unit B, Sir Fang, wow. "It was noisy at Guo Yongyao's place. He was probably meeting with the media, discussing how to put an ad in the newspaper to warn the public and ask them to help catch the murderer.

Another piece of information about the police will be added, which will enhance the reputation of the police force. At least, at a time when serial murders keep happening and the public is mocking and accusing the police of inaction, it is a small way to save face.

"By the way, there is one more piece of information." Fang Zhenyue raised his eyes and glanced at Jiayi. His eyes were burning and focused, like a poet appreciating the full moon in the clear sky.

"What? "Guo Yongyao urged.

"Mr. Chen from the Forensic Department will send you some photos in a while. The murderer may not only be riding an old Phoenix bicycle from the mainland, but also carrying a blue and white stroller with a thermos. One photo of these two things is provided by the New Territories North Serious Crime Unit, and the other is provided to you by Mr. Chen from the Forensic Department of the West Kowloon Serious Crime Unit." Fang Zhenyue spoke slowly and low, and there was a slight metallic sound at the end of each sentence, which was the special timbre brought by the vibration of the chest of a tall and strong man.

"You can even find this? Have you found the witness? "The noisy background noise on Sir Guo's side became smaller. He seemed to have walked out of the conference room and could finally exclaim without restraint.

"No, it was all based on the inference from the crime scene investigation and autopsy."

"...It's so amazing! It's simply wonderful! I'll talk to the media and give you an exclusive interview. Once this method is publicized, it will definitely scare a bunch of bad guys and prevent them from doing evil." Sir Guo's working brain began to take advantage of the issue.

"It wasn't me who thought of it, it was Yi Jiayi. "Fang Zhenyue pursed his lips, with a complex smile on his face, which was filled with both joy and helplessness.

Most of the police force are detectives like him who handle cases step by step, and he is considered the best among them.

And the detective who can push the case forward so quickly, quickly complete the portrait of the murderer, and quickly approach the murderer... probably only the weirdo Yi Jiayi.

Conventional excellent detectives are common, but what about weird genius detectives...

"Oh, this kid is getting more and more outstanding. "Sir Guo let out a click of his tongue, and although he didn't say it out loud, his joyful voice had already exposed his thoughts: in this gorgeous city with the 'most developed economy' and 'most traditional thinking', in this era when women are just beginning to emerge in the workplace, in this era when there is a lack of legendary women, the story of the female inspector will certainly be more eye-catching than Sir Fang's story.

Sir Guo is happy to see Yi Jiayi's strength, and he applauds with both hands and feet~

Fang Zhenyue is, after all, a sharp super detective, who 'knows the meaning of a person's voice'. Just by listening to Sir Guo's fart, he has guessed what kind of poop he is going to poop.

He couldn't help but sneer: "You got a bargain. "

The birth of a legendary female police officer is truly the savior and lucky star of the Public Relations Department.

" "Hahaha, it's the good luck of the Hong Kong police force to have such a sharp sergeant." Sir Guo laughed.

After casually agreeing with Sir Guo, Fang Zhenyue hung up the phone and turned to look at Yi Jiayi.

The female sergeant happened to hang up the phone with the forensic officer. When their eyes met, they smiled at the same time.

"Go on, Eleventh Sister, if you have any other moves, please show them all to me." Fang Zhenyue bowed to her with a cheerful voice.

Jiayi pursed her lips shyly and bowed in reply: "Thank you."

"-. -"Brother Da Guangming.

How? You acted right in front of him? Is "The Joy of the Noble Room" so colorful?