Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 754 An acquaintance commits the crime
Regarding this case, Lu Chuan thought deeply about it before convening the case analysis meeting.

Although the specific cause of death of the deceased has not been completely determined and the results of the autopsy have not yet been released, judging from Lu Chuan's experience, it is very likely that the deceased died of cerebral hemorrhage.

In addition, current investigation results show that the deceased had a brain disease.

So, the murderer's most likely method of killing now is to induce this brain disease in some way.

It could be drugs, or it could be stimulation from other situations.

Judging from Lu Chuan's analysis of the situation at the scene, it is most likely the latter.

As for the secret room murder, the investigation of the scene can basically make a positive judgment.

"Everyone, look inside this lock."

All on-site survey photos were taken by Lu Chuan himself.

Every detail has not been spared.

Several photos flashed by one after another, and everyone was attentive.

"The door locks and window locks are locked from behind. There is no way to open them without damaging them from the outside."

The police officers here have only heard of secret room murders in novels or movies, but they have never actually experienced it.

Others either go to the property to investigate, or visit the neighbors or investigate the interpersonal relationships of the deceased.

All the windows at the crime scene are made of broken aluminum. They can only be opened or closed from the inside. They cannot be operated from the outside without violent destruction.

Lu Chuan continued: "Judging from the current situation, before the property broke the door, the entire room was in a sealed state."

To be honest, many criminal police officers did not pay attention.

In other words, if the murderer chooses to leave through the window, he will definitely leave a certain window open.

It’s not that everyone is incompetent.

The crime scene is located on the second floor. If the murderer left through the window, it is very likely.

This situation exceeded everyone's expectations.

In addition, Lu Chuan carefully checked the condition of all window sills and found no traces of stepping on them.

"I have made a detailed inspection of the four windows at the crime scene. There are no traces of stepping on them, and all the windows were closed from the inside.

So no one noticed that the door lock was locked at the time.

"Although the door lock has been pried open and completely destroyed, judging from the anti-locking device inside, the door was locked when the property manager broke the door open."

I did not understand the on-site investigation in detail.

When arranging the deployment work at the scene today, Lu Chuan and Gao Wenxiang were responsible for the investigation of the crime scene.

Lu Chuan took 17 photos of just the entrance door.

Lu Chuan shook his head: "Xiao Li, open the photos in all windows."

"Marine, is it possible to exit through the window?"

at this point……

"Could it be...suicide?"

Some people wondered whether the police had made a mistake.

The entire room was sealed, and the deceased was likely to die of cerebral hemorrhage.

Is it possible that the deceased died naturally or accidentally?

"No, no, it's impossible to commit suicide. If the deceased died naturally or accidentally, how could her body run from the bathroom to the bed?"

"Isn't it possible to fake a corpse?"

Wang Zhaokai also believed that it was impossible to die naturally.

"Team Lu and Gao Wenxiang found a line on the mirror in the bathroom at the scene: Give me back my life."

"This could not have been written by the deceased himself."

Lu Chuan nodded.

"Zhao Kai is right, those words were indeed not written by the deceased."

"Judging from the current situation, those words were written with soapy water." "It is not visible under normal circumstances, but if the bathroom is full of water vapor, these words can be seen relatively clearly."

"In addition, I found some diaries of the deceased in the living room, and the handwriting on them was completely different from the handwriting on the mirror."

This is also one of the important basis for Lu Chuan's judgment on the secret room murder case.

At the crime scene, there are two obvious pieces of evidence that the murderer once existed.

One is that the body has been moved.

This is one of the most important pieces of evidence.

When Lu Chuan conducted a preliminary inspection of the body in the morning, the marks on its back were not very obvious.

But by the time rigor mortis reached its peak in the afternoon, the marks on the deceased's back had turned dark purple and were very obvious.

The grid size above is highly consistent with the grid size on the bathroom floor tiles.

This means that the first place where the deceased died was the bathroom.

But when everyone found the body, it was on the bed.

The other is the writing on the bathroom mirror.

If the murderer didn't enter the room, how did he leave the writing?
However, the room after the deceased's death was in a sealed state.

This isn't a locked room murder, what is it?
boom.

At this moment, someone opened the door and came in. It was Chen Gang from the No. 1 Squadron.

"Army Corps, the identification results of the black box in the distribution box are out."

Oh?
Lu Chuan took it over and took a look. There were not many words on it.

But the role of the black box is clearly written.

There is a delay switch inside the black box. When the current passes through, it will cut off the current indirectly and can be controlled remotely.

Chen Gang explained to everyone: "The function of this black box is to make the current in the victim's home go on and off."

"So when we turn on the lights in the bathroom, it's not the lights that go on and off caused by poor wiring contact. It's this black box that works..."

It is indeed this thing.

It's a pity that Lu Chuan didn't collect fingerprints on it.

After discovering the black box during the day, Lu Chuan immediately collected fingerprints on it.

But unfortunately, it only has the fingerprints of the property worker who issued it.

This thing couldn't have appeared in the distribution box of the deceased's house for no reason. Someone must have placed it deliberately, and this person was most likely the murderer.

But the other party is also very cautious.

The murderer probably installed this thing while wearing gloves.

However, although no direct information was collected, this small black box also provided an important clue to Lu Chuan and others.

The killer is well versed in circuits, at least familiar with them.

Although it is a secret room murder case, the several existing clues have provided the police with a lot of information.

First, the murderer and the victim should know each other and be able to enter the victim's home and write on the bathroom mirror.

Second, the murderer is proficient in or familiar with circuits.

The remaining thing is to investigate the deceased's interpersonal network based on these characteristics.

As for how the other party managed to kill someone in a secret room.

As long as the suspect is caught, it will always be figured out.

After the meeting, everyone began to investigate Qin Weiwei's interpersonal relationships.

Early the next morning.

The autopsy report was finally released.

The result... was surprising.

(End of this chapter)