Chapter 754: An acquaintance commits a crime
About this case, Lu Chuan thought deeply about this case 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.
Then, 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, there is a high probability that it is the latter.
As for the secret room murder, the on-site investigation can basically make a positive judgment.
“Look at the inside of this lock.”
All on-site inspection photos were taken by Lu Chuan himself.
Every detail has not been spared.
Lu Chuan took 17 photos of just the location of the entrance door.
“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 owner broke the door open.”
This point ...
To be honest, many criminal police officers did not pay attention.
It’s not that everyone is incompetent.
When arranging the deployment work at the scene today, Lu Chuan and Gao Wenxiang were responsible for the investigation of the crime scene.
Others were either going to investigate the property, visiting neighbors or investigating the deceased’s interpersonal relationships.
I did not understand the on-site investigation in detail.
So no one noticed that the door lock was locked at the time.
"Team Lu, is it possible to leave through the window?"
The crime scene is located on the second floor. If the murderer left through the window, it is also very likely.
Lu Chuan shook his head: "Xiao Li, open the photos in all the windows."
Several photos flashed by one after another, and everyone was attentive.
“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 are closed from the inside.
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.
That is to say, if the murderer chooses to leave through the window, he will definitely leave a certain window open.
In addition, Lu Chuan carefully checked the condition of all window sills and found no traces of stepping on them.
Lu Chuan continued: "Judging from the current situation, before the property broke into the door, the entire room was in a sealed state."
"The door locks and window locks are all locked from the outside. There is no way to open it without destroying it.”
This situation exceeded everyone's expectations.
The police officers here have only heard of secret room murder in novels or movies, but they have never actually experienced it.
“Could it be... a suicide?”
Some people wonder if the police made a mistake.
The entire room is in a sealed state, and the deceased is likely to die from 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?"
"Is it possible to fake a corpse? ”
Wang Zhaokai also believed that it could not be a natural death.
"Team Lu and Gao Wenxiang found a line of words on the mirror in the bathroom at the scene: Give me back my life."
"This cannot be 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 by someone with soapy water." "Usually. It cannot be seen, but if the bathroom is filled with water vapor, these words will appear more clearly. ”
"In addition, I found some diaries of the deceased in the living room. 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 evidences 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 back of the deceased 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 did not enter the room, how did he leave the writing?
However, the room after the deceased's death was in a sealed state.
This is not a secret room murder, what is it?
Bang.
At this moment, someone opened the door and came in. It was Chen Gang from the 1st Squadron.
"Team Lu, 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 light in the bathroom, it is not that the circuit is in poor contact. The light that causes the light to turn on and off is exactly 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 with gloves.
However, although no direct information was collected, this small black box also provided an important clue to Lu Chuan and others.
The murderer is proficient in circuits, at least familiar with them.
Although it is a secret room murder case, 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 words 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)