Chapter 574 Criminal Psychological Portrait

At noon, Liu Qingshan's investigation also had results.

meeting room.

"We checked all the surveillance videos in the community, but found nothing unusual."

"Have you also checked the video from the day before the crime?"

Liu Qingshan nodded, "We started all the surveillance videos after Wang Luyao left home the night before the incident."

"The house where Wang Luyao lives is close to the gate of the community, and the surveillance video inside the community can only capture the unit exit of Wang Luyao's building."

"But we couldn't photograph the sunny side of Wang Luyao's house."

Can’t photograph the sunny side?

"That means that if the murderer really escaped from the window along the rope after killing Wang Luyao, no surveillance would be able to record it?"

Liu Qingshan nodded: "Yes, the building where Wang Luyao lives faces the street. Opposite is a small park. There are only two surveillance cameras in it, but none of them are facing Wang Luyao's house."

"And there are no shops downstairs in this building. They are all residential buildings, and no one has installed cameras."

"Are there any signs of climbing on the windows?"

This time Liu Qingshan nodded: "We found no signs of climbing between the windows of Wang Luyao's house and the three-story windows downstairs of her house, but we found a suspected climbing sign on the wall of the resident on the third floor. Traces of pedaling.”

Liu Qingshan operated the projection, and there was a half-footprint on it.

"The third floor below Wang Luyao's house is being renovated. It was just replaced two days before the incident. On the wall outside the plastic steel window wall, the fixed window cement has not yet dried."

"We found half a footprint on this!"

The half-footprint on the projection is not particularly clear, but whose building has footprints on its exterior wall?

"This must be left by the murderer!"

Zhang Yaoming looked excited.

This is the only clue found so far.

Chen Yan was also a little surprised. He didn't expect Liu Qingshan to really find the clue.

Although this half of the vague footprints did not allow Chen Yan to find out the characteristics of the murderer through footprint analysis, it could prove how the murderer left Wang Luyao's house.

"But if this footprint is really left by the murderer, and he really escaped from the window of Wang Luyao's house, then why are the windows of Wang Luyao's house closed?"

Han Lei expressed his doubts.

An important reason for Wang Luyao's suicide was that the doors and windows of Wang Luyao's home were closed.

There are no traces of outsiders.

Bloodstain analysis also showed no evidence of the presence of anyone else.

The blood stain analysis is now easy to explain. The murderer used ether to make Wang Luyao semi-conscious, and then made her sit on him. The murderer manipulated Wang Luyao's right hand to hold a knife to "commit suicide."

In this case, the blood spray will naturally not be blocked by the murderer.

Because the murderer and the victim overlapped at the time, just like the same person.

It's just that the murderer had no idea that the scars on Wang Luyao's body would betray him after his death.

But, apart from these, how are the windows of Wang Luyao's house locked?

"Have you found any clues about the key to the deceased's house?"

Now that the murderer's exit channel has been determined, there are no more than two ways for the murderer to enter Wang Luyao's house.

One is that the murderer climbed into Wang Luyao's house through the window.

Of course, this possibility is very small, because Liu Qingshan has made it clear that no signs of climbing on the windows between Wang Luyao's home and the three neighbors downstairs were found at the scene.

The murderer climbed and borrowed a rope to escape from Wang Luyao's house. There are two different concepts.

Using a rope to escape through a window is a very minimal effort and is likely to leave no obvious evidence.

But climbing is different. An adult climbs from the first floor to the fourth floor, not to mention that the third floor is still being renovated and the cement fixing the windows has not dried yet. If the murderer really climbed up, he will definitely stay. Very obvious traces.

In addition, the other party must ensure that the windows of Wang Luyao's house are open so that they can enter the room without damaging the windows.

The second type is that the murderer took advantage of the five minutes when the system restarted at noon to open the door and come in openly.

This is the most likely, but there is a prerequisite that the murderer must have the key to Wang Luyao's house.

"I checked the records and found that the door locks of Wang Luyao's house were installed uniformly during the renovation of the community. They are standard door locks. I also asked Wang Luyao's husband Zhao Guang and confirmed that the door locks of Wang Luyao's house had never been changed."

Has not been replaced...

That rules out the possibility that the locksmith and others hold the key.

Chen Yan once carefully observed the door lock of Wang Luyao's house. It is a willow leaf-shaped door lock. This kind of door lock is not expensive, but it is very safe. If the lock is opened, it will definitely cause damage to the lock cylinder.

Or you need to use a specially shaped wire tool to open the door lock from the inside of the door through the cat's eye.

There was no sign of damage to the door lock of Wang Luyao's house, nor was there any sign that the peephole had been opened.

Judging from these clues, it is only possible to open the door with the original key.

As for the movie showing that the door can be opened by stirring two pieces of wire in the keyhole, that is all pure fiction.

It's all nonsense.

"But we found two repair reports on the property."

"Repair record of the door?"

Liu Qingshan nodded: "Yes, two weeks ago in May last year."

"We have asked the maintenance staff of the property about the specific situation, and they said that the door of her house was creaking a little."

"Nothing else."

The door made strange noises...twice.

Nothing seems out of the ordinary.

"Any unusual findings?"

"There is nothing abnormal. I just heard from the maintenance worker that when the door was being repaired two weeks ago, Wang Luyao had a few words with a security guard, but there was no conflict."

security guard?

"Do you know why we were quarreling?"

"When the maintenance was being carried out, there was only one maintenance worker on duty in the community. During the maintenance, a security guard was called to help."

"It seems that the security guard accidentally broke an ornament at the door of Wang Luyao's house."

"Wang Luyao said a few words to the security guard, but she didn't ask the security guard to pay any money, and the matter passed."

"There was no conflict?"

Liu Qingshan shook his head: "After knowing this situation, I checked the surveillance in the corridor at that time."

"After the security guard broke the ornaments, Wang Luyao asked him why he was so careless. The security guard didn't say anything and continued working. Then Wang Luyao seemed to be angry."

"No wonder that security guard is just a security guard and doesn't work carefully at all."

"The security guard may have been angry because of this sentence, so he said a few words. The maintenance master persuaded him and let it go."

"There was no major conflict between the two."

"I've also seen that security guard. He was off duty on the day of the incident and was not in the community."

Chen Yan nodded. Liu Qingshan's investigation could be said to be quite detailed.

The security guard who only had a few arguments with Wang Luyao investigated the specific situation.

"Did you find anything else?"

"That's all for now."

That’s all for now…

After the report, Chen Yan was alone in the office thinking.

Based on the analysis of the interpersonal background of Wang Luyao and Zhao Guang, the possibility of vendetta and love killing is basically ruled out. Wang Luyao's family's property has not been damaged at all, and the situation of murder for money and death can also be ruled out.

Killing with passion?

Not too possible.

This murderer is very cunning and cautious.

He was able to evade all surveillance, and when he killed Wang Luyao, he left no trace at the scene by letting Wang Luyao lean on him, and successfully forged the situation at the scene of Wang Luyao's suicide. Judging from the situation at the scene of Wang Luyao's suicide, the other party must have carefully planned it. Carefully planned.

In fact, up to now, although the murderer has not been found and his motive for committing the crime has not been found, the murderer's crime process has been basically restored.

The only question is who closed the windows of Wang Luyao's house after the murderer escaped?

If you find this person, you will also find the murderer.

In the office, Chen Yan was conducting a criminal psychological profile on the murderer.

Criminal psychological profiling is actually a comprehensive subject classification, and there is a major in the police academy that specializes in this area of ​​research.

Chen Yan once took a course in this area, but the research was not in depth.

The so-called criminal psychological profiling is actually to infer the criminal's behavioral characteristics and even physical characteristics based on the trace investigation at the crime scene.

Although Chen Yan doesn't do much research on psychology, he has the ability to analyze micro-expressions that is systematically rewarded. This skill is actually a practical application of psychology.

Coupled with Chen Yan's meticulous control of the scene and psychological portrait of the criminal, Chen Yan is still certain.

In fact, the so-called psychological portrait is not something profound and obscure.

Many experienced front-line detectives apply this knowledge subconsciously.

For example, some detectives can catch criminal suspects while eating.

What he relies on is that intuition at a glance.

The reason why he had this intuition was because the long period of handling cases gave the detective a subconscious image of a criminal.

That's why I had that intuition at a glance.

According to the situation at the scene, the murderer definitely did not commit the murder on a temporary basis, but had already planned it.

Throughout the entire crime process, the murderer left no trace at the crime scene, indicating that the murderer was very cautious.

There are no signs of climbing on the doors and windows of Wang Luyao's home and the doors and windows on the three floors below her home, so the murderer probably did not enter and exit Wang Luyao's home through the windows.

Combined with the video surveillance of Wang Luyao's community, there is a 5-minute restart time at 12 noon every day. The murderer should have seized this gap and entered Wang Luyao's home.

Moreover, the murderer has the key to Wang Luyao's house.

The murderer was very patient. He stayed at Wang Luyao's house from 12 noon until Wang Luyao came home in the evening before taking action.

Be cautious, careful, patient...

Although I don’t know what the relationship between Wang Luyao and the murderer was, and I don’t know what the murderer’s specific motive was, one thing is certain.

After the murderer used ether to make Wang Luyao semi-conscious, he used Wang Luyao's right hand to hold a knife and committed suicide in an execution style.

Thirty-two cuts. In a semi-conscious state, a woman watched the murderer cut her body more than thirty times, and this lasted for several hours.

This shows that the murderer is very cruel and has a strong desire for revenge.

Generally speaking, such people are not good at words and their speech is dull.

He's the kind of person who doesn't erupt, but when he erupts, it's like a volcano erupting.

Introverted and not good at words.

In addition, the murderer had a certain understanding of the detective's investigation procedures.

Know how to hide your traces in the field.

In addition, the murderer should be relatively thin, not overweight, at least not fat, and should be around 170cm tall.

There are two important clues that Chen Yan can draw these conclusions from.

One is the button-shaped corpse spot on the back of Wang Luyao’s body.

Clothes of different sizes have different spacing between buttons. From this point, the size of the clothes worn by the murderer can be judged, and the height of the murderer can be roughly judged.

There were also footprints left by the murderer on the wall on the third floor.

Although some physical characteristics of the murderer cannot be determined from the footprints because the footprints are incomplete, the size of half of the footprints can determine the size of the murderer's feet, which are size 40 shoes.

The human body is a coordinated organism, and height and weight will affect many physical characteristics.

Based on the murderer's height and shoe print size, the murderer's size can be roughly determined.

Also, the windows in Wang Luyao’s house are standard 75 centimeters wide.

If you are an obese person, it does not mean that you cannot get out, but it is very likely that you will leave some clues on the window.

While analyzing, Chen Yan drew the image of the murderer on the paper.

170…

Thin body type...

Size 40 shoe print…

Introverted, reticent, cautious...

A faceless outline picture appeared in front of Chen Yan.

This person can also have access to the key to Wang Luyao's house...

call……

Two hours later, Chen Yan let out a long breath.

The clues are still too slim.

With the above information, it is impossible to identify the suspect.

Chen Yan stood up, twisted his stiff neck, and walked to the window to get some air.

Suddenly, Chen Yan's right hand, which was about to open the window, froze in mid-air.

Secret room!

The windows of Wang Luyao’s house!

Chen Yan suddenly had a flash of inspiration in his mind, but it seemed very vague and he couldn't catch it.

When Zhang Yaoming and the detective team arrived at the scene, the windows of Wang Luyao's home were closed, and the entrance door showed no signs of damage or abnormal opening.

In addition, there were no traces left by the murderer at the scene, so the initial judgment at that time was that Wang Luyao committed suicide.

Now, although through the autopsy and the special-shaped spots on the body's back, it has been determined that Wang Luyao committed suicide, and the entire process of the murderer's crime has been simulated.

However, how the murderer left the crime scene through the window and then closed the window has always been a problem that has troubled Chen Yan.

But who says the murderer must close the window when leaving the scene of the crime?

No need at all!

As long as the murderer closes the window before the detectives arrive, it will give the illusion of a secret room.

Moreover, before Zhang Yaoming came, only one or two people had entered Wang Luyao's home recently.

After Wang Luyao's mother discovered that Wang Luyao was dead, she first called the security guard and then called the police.

Before Zhang Yaoming entered the scene with members of the detective team, many security guards and property personnel had already entered the scene.

Chen Yan even watched this video himself. He remembered all the people entering and leaving very clearly. There were 12 people in total.

Because what Chen Yan initially suspected was that the murderer was playing a deception trick. After killing Wang Luyao, he did not leave the scene immediately. Instead, he waited for the property management personnel to enter the room, mixed in with the property management personnel, and left the scene of the crime in troubled waters.

It’s not new for best friends to help their best friends catch their best friends.

Now that I think about it...

Chen Yan seems to have missed something.

Chen Yan only considered that the murderer might be hiding in Wang Luyao's home, and then used the property management staff to enter the room and leave in the chaos.

But what if it's the other way around?

Is it possible that the murderer was actually one of these property personnel who entered the room?

The murderer killed Wang Luyao at 3 a.m. and left the scene of the crime through the window. Later, after Wang Luyao's mother found the body and called the police the next day, she took advantage of the chaos to enter the room and closed the unlocked window, thus creating a The illusion of suicide in a secret room.

Is this possible?

have!

Of course!

Some property staff or security guards are not professional detectives after all, so it is difficult for them to notice these details.

Therefore, as long as the murderer closes the window before the real detective arrives, the secret room is actually formed.

Not only that, but the murderer's caution came into play here because there were no fingerprints left on the window.

The murderer had obviously anticipated this.

But, is this really the case?

Standing in front of the window, Chen Yan's pupils were slightly dilated, without any focus.

But in my mind, I kept thinking about the surveillance video from when Wang Luyao's mother reported the crime, from when the property management staff entered the room to when Zhang Yaoming showed up with people.