wavenovel Chapter 1242 Knife
Chapter 1242 Knife
Chapter 1242 Knife
"The murderer held the knife in his right hand and stabbed the victim in the abdomen and neck. From the photos and bone fragments, the stabs were deep and powerful. The rib stab marks were on the right side, from front to back, slightly tilted downward, indicating that the stab was from the front, with the tip of the knife pointing downward. The cervical vertebrae stab marks were on the front side, and the stab direction was from top to bottom, indicating that the murderer was above the victim when he stabbed the neck, or the victim was in a supine position."
When Jiang Yuan spoke, he moved his fingers and Miao Ruixiang next to him quickly took notes.
Shen Changfeng didn't react for a while, until the captain next to him patted his shoulder again, Shen Changfeng took out a notebook and started to take notes, but he was still a little confused. Why did he suddenly start to dictate the autopsy report? And such a professional analysis? Wasn't it a bit too direct? Didn't he need to check it again and again?
Shen Changfeng was thinking in his mind, and he really didn't know what to write down in his hand. His eyes unconsciously glanced at the bone fragment in Jiang Yuan's hand.
These bones came out of his hands. He had looked at many of the bones several times. If he had to, he could recite Jiang Yuan's analysis from the book, but how to connect the marks on the bone fragments with the marks in the book was a problem. Most people's bones, like the people themselves, were not as white as jade.
"So, the murderer probably stabbed the victim's abdomen first, from top to bottom... The victim fell to the ground, and he continued to stab the neck, which left marks like this." Jiang Yuan summarized and gestured the location on the scene.
Cui Qishan looked at it and couldn't help but ask: "So, the murderer is very tall? He must be 20 to 30 centimeters taller than the victim? How tall is the victim?"
"The victim is about 1.72 meters tall." Li Guangnian, captain of the First Brigade of the Donghua City Criminal Police Detachment, spoke immediately.
Cui Qishan's eyes lit up, like Sherlock Holmes: "So, the murderer is a giant who is over 1.9 meters tall, and very likely 2 meters tall? For such a person, people who meet him may have some impression of him. Although it has been a long time, if they are guided properly... at least, he should be very prominent in the surveillance video..."
"It is also possible that the victim was sitting when the murderer killed him." Jiang Yuan interrupted Cui Qishan's beautiful fantasy and continued, "There is an oblique cut on the front edge of the lumbar vertebrae on the right side of the eighth rib, which is about 8 degrees downward in direction and horizontal, and the xiphoid process of the sternum is not damaged... So, the murderer was standing and the victim was sitting."
The light in Cui Qishan's eyes quickly went out, as if he had heard that the blind date was not in the series.
"That doesn't mean the murderer is 20 centimeters taller than the victim when he was sitting." Xiao Si drew inferences from one example: "The murderer was most likely bent over and stabbed."
"Indeed, it is difficult to judge the murderer's height for the time being." Jiang Yuan nodded.
While several people were talking, Shen Changfeng kept his eyes closer to the bone piece in Jiang Yuan's hand, and gradually twisted himself into a strange shape.
"What are you doing weird?" Li Guangnian slapped him in the face.
Shen Changfeng was beaten to the point of nearly having ventricular fibrillation. His gluteal muscles contracted, and he said, "I want to see the eighth rib on the right side."
Jiang Yuan heard it and handed it to Shen Changfeng.
Shen Changfeng took it a little embarrassedly, and while looking at it under the light, he whispered: "This scratch... the edge doesn't seem to be very sharp..."
"It is indeed easy to confuse." Jiang Yuan admitted that ordinary forensic scientists could not reach Level 1 forensic anthropology technology. This was not a derogatory statement. Forensic anthropology itself was very difficult, and its practical applications were not widespread for ordinary forensic scientists. It was more like assembly language to programmers. If you understand it, you are awesome, and if you don't, it is normal.
Early forensic doctors may often encounter corpses from old cases, but without systematic training, their mastery of forensic anthropology would not be very deep. Today's forensic doctors encounter the most injuries assessments in their daily lives, such as unnatural deaths such as suicide and traffic accidents, and occasionally some cases of passion killings. In other words, forensic doctors in big cities may perform dozens of autopsies a year.
For a forensic pathologist like Shen Changfeng, ordinary murder cases can be solved by simply performing an autopsy, and forensic anthropology is actually not necessary.
Seeing Shen Changfeng's interest, Jiang Yuan said, "Generally speaking, it is indeed necessary to have a sharp edge to determine whether it is a scratch caused by a sharp weapon. But there are two points in this case. First, the murder weapon may not be particularly sharp. It may be a blunt knife that has not been sharpened much, or something else. Second, you can do SEM."
Shen Changfeng laughed awkwardly: "We don't have a scanning electron microscope either."
Although cheap scanning electron microscopes can cost hundreds of thousands of yuan, government procurement is not calculated that way. Funding allocations for police stations and laboratories in different regions are also different, and the vast majority of police stations do not have scanning electron microscopes.
Jiang Yuan, as a forensic doctor of the county bureau, also knew this and nodded kindly: "Then use a stereomicroscope to mainly look at the trabeculae at the bottom. If they are neatly cut and show no signs of corrosion, then they are knife marks. Otherwise, they could be caused by an animal bite or something. However, this scratch is more difficult to judge, so we can combine it with the scars in other places to make a judgment."
Shen Changfeng originally thought that he would be carved, but after listening to Jiang Yuan's explanation, he was relieved and confident at the same time, and said: "For example, the lumbar spine, the front edge of the vertebral body L1 to L3, but this scratch feels oblique."
"The murderer stirred it." Jiang Yuan said calmly.
Shen Changfeng immediately had a picture in his mind: "Stab it in with a knife, and then stir it a few times?"
"Well, it's hard to draw the knife without stirring." Jiang Yuan's expression became even colder, and he said, "The victim was in good health. Since the murderer was holding a sharp knife, he should still have the strength to resist after stabbing him in the abdomen. Therefore, the murderer may have stirred the victim vigorously twice after encountering resistance, causing pain to the victim and reducing his resistance. The murderer pulled out the knife and stabbed the victim's neck directly, causing the victim's trachea to rupture, blood to rush into the lungs, and mechanical asphyxiation to death."
"In this case, the place where the deceased is is the place where the body was abandoned, not the first scene?" Li Guangnian said and began to imitate the actions Jiang Yuan said, with a sad face.
Jiang Yuan nodded, and explained to Li Guangnian beside him, "Forensic anthropology is still a relatively niche field."
If each bone in the human body is regarded as a life cycle of one month, then examining more than 200 bones in the human body is like examining a person's life for more than 200 months, to see what went wrong in these 200 months of life, and even the cause of death.
For example, the 8th rib on the right side is like looking at the 15th month of a person’s 8-year-old life. On this day, he encountered a major setback, leaving a mark.
Corresponding to the bone, this is a scratch.
For a forensic doctor, finding the scratch is one thing, determining the nature of the scratch is another, and finally confirming that it is a knife mark is not as easy as imagined.
When a corpse is exposed to the outside, it is bound to encounter various challenges. Insects, rats, birds, stray cats and dogs, etc. may all invade the corpse. It is not possible to judge that it is a sharp weapon injury just by seeing scratches or something.
Li Guangnian naturally understood Jiang Yuan's explanation and said with a smile: "We actually invited other experts to analyze this case, but none of them analyzed it as clearly as you did. The experts at that time also praised Xiao Shen, saying that the young man did a good job in protecting the scene. Unfortunately, it happened to be a rainy day..."
Jiang Yuan did not continue the topic of the other experts, and turned around and said: "I think we can try to start with the murder weapon in this case."
Li Guangnian said hurriedly: "You go ahead."
Jiang Yuan: "First of all, the form of this case does not seem like a premeditated murder. It is not as clean and neat as the other two rainy night cases. Therefore, this case can be considered as a more elementary state of the murderer, while the following two cases, at least from the method, are more like upgraded. Of course, the gender of the victims is different, and the resistance is different..."
"Changing gender can also be a way to upgrade." Liu Jinghui interjected, "Only those who have killed people know that killing women is easier than killing men."
Several people present nodded slightly.
Jiang Yuan continued: "From this point of view, the murder weapon may not be a very professional knife. I need to go back and continue drawing to confirm this. Now, I suggest that we focus on investigating the victim's life traces a few days before his death, the people he had contact with, etc...."