The conference room of the criminal investigation detachment of Yunhe City.

Jiang Rong is posting some photos taken by the forensic team on the whiteboard in the conference room for display. Under the guidance of Wen Qiao, several of their interns completed the autopsy of Wang Ming, so the task of reporting the results of the autopsy fell to Jiang Rong.

This was the first time she had made a formal report at the detachment's case analysis meeting, and she couldn't help but feel a little nervous, and her round face was a little flushed.

"Yesterday we completed the autopsy of Wang Ming. Through our examination of the deceased's body and interviews with eyewitnesses at the scene, the time of the deceased's death can be accurate to 8:05 p.m. ”

"The deceased did not encounter any obstructions during the fall from a height, but directly hit the concrete floor. Due to the action of the center of gravity, the deceased's head hit the ground first, so there was a severe comminuted fracture of the skull, a skull base fracture, a compression fracture of the cervical vertebrae, and a contusion and spill of brain tissue. There are bleeding phenomena in the ears, nose and mouth, and the eyelids are bleeding under the skin, which is blue-purple. Extensive subcutaneous hemorrhage, contusion, laceration on the side of the trunk directly touching the ground. The internal damage was severe, and the spleen and liver were severely ruptured. ”

"Therefore, we judged that the direct cause of Wang Ming's death was severe head injury and internal organ damage caused by a high fall."

Hearing Jiang Rong's conclusion, Ling Feng couldn't sit still, he interjected and asked, "You mean Wang Ming was still alive before he fell from the upper floor?" Did he fall from a building before he died? ”

"At least from the autopsy results." Jiang Rong nodded. "Most of Wang Ming's physical injuries are caused by one-time violence, that is, the concussive effect of huge violence at the moment of falling to the ground. There is more obvious bleeding around the liver, spleen pedicle and kidney pedicle, and if the body is thrown after death, because the heart has stopped beating and cannot continue to supply blood to the internal organs, the bleeding of these organs after a violent impact is often mild. As she spoke, Jiang Rong put a few photos on the conference table and showed them to everyone.

This conclusion was obviously a bit unexpected by Ling Feng, and all kinds of unreasonable doubts on the scene made him naturally think that Wang Ming had been killed and thrown away, but what Jiang Rong said later made him feel energetic.

"Although Wang Ming's body was not thrown from the upper floors after his death, we also found something unusual about his body."

"First of all, although he had a comminuted fracture of his skull, we found that in addition to the high-level fall injury formed at one time, there was also a relatively minor impact based on the force of the bone. And it is likely that this impact preceded the high fall, because around this smaller wound we find a slight life reaction, that is, the phenomenon of blood clotting. This shows that Wang Ming may have been hit on the head by some kind of object before he fell from the upper floor, and it was this blow that made him lose his ability to resist and gave the murderer a chance. ”

"In addition, because when the body of a person who jumps off a building and commits suicide falls down, in addition to the downward force, there will also be a force that rushes outward, and when he accidentally falls, is pushed down, or kills and throws his body, there is often only a downward force, and the force of rushing out is very small or nothing. So. The projection distance between the end of the fall and the beginning of the fall of a suicidal person tends to be greater than that of several other accidents. According to statistics, the ratio of the distance between the landing site of the body of a person who committed suicide and the wall foundation of the building and the height of the fall is generally greater than 1/7, and the ratio of the person who accidentally falls or kills the body is generally less than 1/7. In our case, Wang Ming's fall distance was within less than 1/7. ”

"Therefore, we judge that Wang Ming was first hit by some force, causing him to fall into a coma, and then he was thrown from a tall building, causing death."

After saying the last sentence, Jiang Rong took her eyes off the information in her hand and looked at the others present, as if she was a student asking the teachers to comment on the homework.

Ling Feng nodded, affirming her work: "Other than that, are there any other discoveries?" What we need is evidence to catch the killer. ”

Jiang Rong was stunned by his question, she had already finished saying all the information she could get from the corpse, it stands to reason that there was only so much that their forensic doctors could do, they really didn't know how to answer Ling Feng's question, so they could only look at Wen Qiao for help with a bewildered expression.

Wen Qiao didn't look at her, and there was an embarrassing silence in the conference room for a while.

"You value physical evidence too much." After a long time, Wen Qiao suddenly said something soft.

Ling Feng was not convinced: "This is strange. What do we look at when we don't look at physical evidence? Physical evidence is the most objective and irrefutable piece of evidence. ”

"I mean you're focusing too much on 'what's there' and not on 'nothing.'"

"What do you mean by that?"

"You all heard Jiang Rong's report just now, we can restore what may have happened at the scene." Wen Qiao said slowly: "That night, Wang Ming got off work early in the morning, but for some reason he suddenly turned back to the office, and this time was about 7:30 in the evening. Strangely, he went not to his own office, but to Colliers's office. When he entered the room, he was suddenly attacked, causing him to suffer a blow to the head, fainting and bleeding to the floor. This explains why the killer dumped a large amount of sodium hypochlorite solution on the ground. ”

"This is also what I have always been unable to figure out, it is common for murderers to want to destroy evidence, but it is so blatant, doesn't it clearly tell us that there is something wrong with this case?" Ling Feng asked.

"Because this murderer knows in his heart that faking suicide will not work. With such a clumsy method, the forensic doctor can find out with a little care, and the police will definitely know that there is something wrong with Wang Ming's death. Since the police will find out the problem anyway, it is better to completely destroy all the biological evidence than to go through the trouble of covering it up carefully and without leaving a trace. ”

At the same time, it illustrates a problem. The murderer probably didn't have much time to clean up the scene, so the attack on Wang Ming was probably unexpected, rather than a premeditated killing. ”

"Not premeditated?" Ling Feng disagreed with this point of view in his heart. "If there was no premeditation, why would he prepare so many sodium hypochlorite solutions to destroy the evidence?"

Wen Qiao glanced at him with some approval: "Although your reasoning ability is not very good, you are thoughtful. ”

These words were exaggerated and derogatory, Ling Feng finally resisted the urge to roll his eyes, and waited patiently for him to continue.

"The first impact wound on Wang Ming's head was formed by an object that was not too sharp or too hard. Based on this, I later went to the site again to see if there was anything around me that could form such a wound. Sure enough......" Wen Qiao paused, and suddenly knocked on the table in front of him with his hand.

"His head must have hit the corner of the table, and I extracted a trace of blood in the corner of the table, and the DNA comparison results have not yet come out, but I believe there should be no problem."

"And his use of sodium hypochlorite solution to destroy evidence not only does not show that he was premeditated, but it is even more powerful proof that the story was sudden."

"How?" Ling Feng asked.

"When committing a premeditated crime, they often make a series of preparations and plans in advance, and carry murder weapons, props and other items to the scene of the crime. In those cases caused by impulsiveness or accident, the murderer will often use those things that are within reach in the process of committing the crime and cleaning up the scene, such as the ashtray on the coffee table, the kitchen knife in the victim's house, the mop, etc. ”

"What do you mean...... Those sodium hypochlorite solutions are what were already on site? How could such a coincidence occur? Ling Feng was puzzled.

"Maybe it's not a coincidence." Wen Qiao said: "Have you forgotten that two weeks ago, in the next room, there was an even more exaggerated bloodshed? ”

Ling Feng's eyes widened in shock.

"That's right. After Colliers was killed in another office, the company hired a special cleaning crew to clean up the place. In order to completely clean up the site and eliminate the doubts and fears of employees, they also purchased a large amount of bleach and sanitized the site many times. I asked the staff at Boya about the three bottles of sodium hypochlorite solution that were left over from the last time the site was cleaned up and were later placed in a corner of the bathroom. ”

"Given the time between Wang Ming's first assault and his throwing, it can be assumed that the killer did not have enough time to clean up the scene of the crime. But in a hurry, he not only completed a series of complicated tasks such as formulating a follow-up plan, cleaning up the scene at the time of the crime, and transferring the body. This means that he probably knew that there were three bottles of bleach in a corner of the company that could eliminate all biological evidence, so that he could get straight to the point without having to search the entire company for available tools or materials. That's why he was able to do it all in such a short time. ”

Everyone listened to his reasoning and couldn't help but secretly admire it in their hearts.

Only Ling Feng frowned and pondered: "If your reasoning is true, then the murderer is very likely to be an employee of Boya Company, because only they know best what things are in their company." ”

"It's possible, but it's not likely."

"What do you say?"

"If they are employees of Boyaa, then they can stay in the company with a bright and reasonable attitude. There are also a lot of opportunities to do small things you want, and you don't have to sneak around after everyone is gone. Even if you are caught staying at the office late, you can use overtime and other reasons as an excuse. Why is it necessary to do this? What's more, he also erased an entire floor of surveillance. ”

"And did you notice that this murderer only used his hands on the 15th floor of surveillance? The monitoring at the entrance of the building and at the entrance and exit of the park is normal. After we arrived at the scene of the crime, we immediately checked the surveillance video of these entrances and exits, and at that time period of the crime, we did not see any suspicious persons. We have also found the few people who have been in and out, and after questioning, they have been ruled out of suspicion, which you should know best. ”

Ling Feng nodded.

"After the murderer finished the crime on the 15th floor, he disappeared into the building out of thin air, and no one was photographed at the entrance and exit of the building where the boya company was located after 8:05."

Ling Feng felt that the answer was already coming out.