Chapter 753: Familiar Hand at Work

Regarding this case, Lu Chuan did some very deep thinking before holding the case analysis meeting.

Although the exact cause of death of the deceased has not been fully determined yet, and the results of the autopsy have not been released, based on Lu Chuan’s experience, the possibility that the deceased died from a brain hemorrhage is very high.

Additionally, the current investigation results show that the deceased originally had a brain condition.

Thus, the most likely method the murderer used to kill may have been through some means of triggering this brain condition.

It could be drugs, or it could be some other kind of stimulation.

From Lu Chuan’s analysis of the scene, it is highly likely to be the latter.

As for the locked-room murder, the on-site investigation can basically make a definitive judgment on this point.

"Everyone, look inside this lock."

All of the site investigation photos were taken by Lu Chuan himself.

Not a detail was missed.

Just at the location of the entrance door, Lu Chuan took 17 photos.

"Although the door lock was pried open, completely destroyed, from the internal locking mechanism, the property management found that the door was locked from the inside when they broke it."

This point...

To be honest, many detectives did not notice.

It’s not that everyone lacks the ability.

When arranging work on-site today, Lu Chuan and Gao Wenxiang were responsible for the on-site investigation.

Others either went to the property management for investigation, visited neighbors, or investigated the deceased’s social network.

They did not have a particularly detailed understanding of the on-site investigation situation.

So no one noticed that the lock was in a locked state at that time.

"Captain Lu, is it possible to leave through the window?"

The crime scene is on the 2nd floor, so the possibility of the murderer leaving through the window is also high.

Lu Chuan shook his head, "Li, bring up all the window photos."

Several photos flashed by in sequence as everyone focused intently.

"I have thoroughly checked the four windows at the crime scene, found no signs of climbing, and all the windows were closed from the inside.

All windows at the crime scene are made of broken bridge aluminum and can only be opened or closed from the inside. Without violent destruction, they cannot be operated from the outside.

This means if the murderer chose to leave through a window, there must be a window left open.

Additionally, I carefully checked all the window sills and found no signs of climbing.

Lu Chuan continued, "From the current situation, the entire room was closed before the property management broke in."

"The door lock and window lock were both in a locked state, making it impossible to open them without external force."

This situation was beyond everyone’s expectations.

The police had only seen locked-room murders in novels or movies, but never experienced one in reality.

"Could it be... suicide?"

Someone questioned whether the police might be mistaken.

The entire room was in a sealed state, and the deceased most likely died from a brain hemorrhage.

Isn’t it possible that the deceased died naturally or accidentally?

"No, no, it couldn’t be suicide. If the deceased died naturally or accidentally, how did the body move from the bathroom to the bed?"

"Reanimated corpse?"

Wang Zhaokai also believed it couldn’t be a natural death.

"Captain Lu and Gao Wenxiang found a line of words on the bathroom mirror: ’Return my life.’"

"It couldn’t have been written by the deceased."

Lu Chuan nodded.

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

"From the current situation, those words were written with soap."

"You can’t see it under normal conditions, but if the bathroom is foggy, these words will become quite clear."

"Additionally, I found some of the deceased’s diaries in the living room, and the handwriting on them is completely different from the writing on the mirror."

This is also one of the important reasons for Lu Chuan to judge it as a locked-room murder.

At the crime scene, there were two clear pieces of evidence of the murderer’s presence.

One is that the body was moved.

This is one of the most important pieces of evidence.

During Lu Chuan’s preliminary examination of the body in the morning, the markings on its back were not very obvious.

However, by the afternoon, when rigor mortis reached its peak, the marks on the deceased’s back turned a deep purple and were very noticeable.

The size of the grid on the back matched highly with the grid size of the bathroom floor tiles.

This indicates that the first place the deceased died was the bathroom.

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

The second piece is the writing on the bathroom mirror.

If the murderer didn’t enter the room, how did they leave the writing?

But after the deceased died, the room was in a closed state.

Isn’t this a locked-room murder?

Bang.

At this time, someone entered through the door; it was Chen Gang from the first unit.

"Captain Lu, the identification results of the black box in the distribution box are out."

Oh?

Lu Chuan took a look at it, and while there weren’t many words, the function of the black box was clearly stated.

Inside the black box is a delay switch that intermittently cuts off the current when electricity passes through it and can also be remotely controlled.

Chen Gang explained to everyone, "The purpose of this black box is to make the victim’s home electricity switch on and off intermittently."

"So when we turned on the light in the bathroom, it was this black box, not a loose connection, that caused the flickering."

So it was this thing indeed.

But unfortunately, Lu Chuan couldn’t collect any fingerprints on it.

During the day, after discovering this black box, Lu Chuan immediately attempted to collect fingerprints from it.

But unfortunately, only the fingerprints of the property worker who found it were present.

This thing could not have appeared in the deceased’s distribution box for no reason; someone intentionally placed it there, and that person is most likely the murderer.

However, the other party is also very cautious.

The murderer should have installed this thing wearing gloves.

Although no direct information could be collected, this small black box provided Lu Chuan and others with an important clue.

The murderer is proficient in circuits, or at least familiar with them.

Although it’s a locked-room murder case, the existing clues have already provided the police with a considerable amount of information.

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

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

What’s left is to investigate the victim’s social network based on these characteristics.

As for how exactly they managed the locked-room murder,

as long as the suspect is caught, it will eventually become clear.

After the meeting adjourned, everyone began to investigate Qin Weiwei’s social relationships.

Early the next morning.

The autopsy report finally came out.

The result... was astonishing.