Chapter 1228

"The killer is right-handed, and successively stabbed the victim's abdomen and neck. From the photos and bone pieces, the entry was very deep and the force was very great. The stab marks on the ribs are on the right side, from front to back, slightly tilted downward, indicating that it was stabbed from the front, with the knife tip downward. The stab marks on the cervical spine are on the front side, and the entry direction is from top to bottom, indicating that when the killer stabbed the neck, he was above the victim, or the victim was in a supine position."

When Jiang Yuan was speaking, he moved his fingers, and Miao Ruixiang next to him hurriedly recorded it.

Shen Changfeng didn't react for a while. It wasn't until the captain next to him patted his shoulder again that Shen Changfeng took out a notebook and started recording, but he was still a bit confused. How could he suddenly start dictating the autopsy report? And it was such a professional analysis? Is it a bit too direct? Doesn't it need to be checked three times?

Shen Changfeng thought in his heart, and he really didn't know what to record in his hand, and his eyes drifted to the bone pieces in Jiang Yuan's hand unconsciously.

These bones flowed out of his hands. He had also looked at many bones several times. If he had to say, he could also recite Jiang Yuan's analysis, but how to connect the traces on the bone pieces with the traces mentioned in the book was a trouble. Most people's bones, just like the people themselves, are not shaped like white jade.

"So, the killer likely stabbed the victim's abdomen first, poking from top to bottom to here... The victim fell to the ground, and he continued to stab the neck, and then there would be such traces." Jiang Yuan summarized and gestured the position on the spot.

Cui Qishan watched and couldn't help but say: "In this way, the killer's height is very tall? Is he 20 or 30 centimeters taller than the victim? How tall is the victim?"

"The victim is about 1.72 meters tall." Li Guangnian, the captain of the First Brigade of the Donghua City Criminal Police Detachment, said immediately.

Cui Qishan's eyes lit up, like Sherlock Holmes: "Calculated this way, the killer is a giant over 1.9 meters tall, likely 2 meters tall? For such a person, the people he met might have some impression. Although some time has passed, if guided properly... at the very least, looking at the surveillance video, it should also be very prominent..."

"It's also possible that when the killer killed, the victim was sitting." Jiang Yuan interrupted Cui Qishan's beautiful fantasy and said: "The right 8th rib and the anterior edge of the lumbar spine have oblique cut marks, the direction and the horizontal plane are about 20 degrees downward, and there is no damage to the xiphoid process of the sternum... Therefore, the killer was standing and the victim was in a sitting posture."

The light in Cui Qishan's eyes extinguished rapidly, like hearing that his blind date was not in the system.

"That doesn't mean the killer's height is 20 centimeters taller than the victim's sitting posture." Xiao Si drew inferences from one instance: "The killer is likely bending over to stab."

"Indeed, the killer's height is temporarily difficult to judge." Jiang Yuan nodded.

Shen Changfeng took advantage of the time when several people were talking, his eyes constantly approaching the bone pieces in Jiang Yuan's hand, and gradually twisted himself into a strange shape.

"What kind of monster are you doing?" Li Guangnian gave him a slap "slap."

Shen Changfeng was almost fibrillated, his gluteal muscles tightened, and he said: "I want to see the right 8th rib."

Jiang Yuan heard it and handed it to Shen Changfeng.

Shen Changfeng took it a bit embarrassedly, and while placing it under the light to look, he whispered: "This scratch... the edge doesn't seem very sharp either..."

"It's indeed easy to confuse." Jiang Yuan defaulted that ordinary forensic doctors could not reach the forensic anthropology technology of LV1. This is not any belittlement. The difficulty of forensic anthropology itself is very great, and its practical application is not wide for ordinary forensic doctors. It is more like assembly language to a programmer. If you understand it, you are amazing. If you don't understand it, it's actually normal.

Early forensic doctors might often encounter cold case corpses, but without systematic training, their mastery of forensic anthropology would not be very high. Nowadays, forensic doctors encounter the most injury identification in their daily lives, which are non-normal deaths such as suicide and traffic accidents. Occasionally, there are some passionate murder cases, which are autopsies that forensic doctors in big cities can do dozens of times a year.

For forensic doctors like Shen Changfeng, ordinary murder cases can just be done with ordinary autopsies. Forensic anthropology is actually not used.

Jiang Yuan saw that Shen Changfeng was interested, so he said: "Usually, it really needs to have sharp edges to judge that it is a scratch from a sharp weapon, but there are two points in this case. The first point is that the murder weapon itself might not be particularly sharp. It could be a blunt knife that hasn't been sharpened, or something else. The second point is that you can do SEM."

Shen Changfeng gave a wry smile: "We don't have a scanning electron microscope either."

Although there are cheap scanning electron microscopes for more than 100,000, government procurement is not calculated like this. The distribution of funds for police stations and laboratories in different regions is also different. Police stations without scanning electron microscopes are the vast majority.

Jiang Yuan, as a county bureau forensic doctor, also knows this point, and nodded kindly: "Then use a stereomicroscope, mainly to look at the bone trabeculae at the bottom. If it is neatly cut off without signs of corrosion, it is a knife mark. Otherwise, it might be animal biting or something. However, this scratch is relatively difficult to judge. You can combine it with the wounds in other locations to judge."

Shen Changfeng thought he would be scolded. Listening to Jiang Yuan's explanation, he suddenly breathed a sigh of relief, and at the same time had confidence, saying: "For example, the lumbar spine, the anterior edge of the vertebral body L1 to L3, but this scratch feels oblique."

"The killer stirred it." Jiang Yuan said relatively calmly.

Shen Changfeng immediately had a sense of imagery: "Stabbed in with one knife, and then stirred a few times?"

"Hmm, it's not easy to pull out the knife without stirring." Jiang Yuan's expression was a bit colder, saying: "The victim's body is good. Since the killer is holding a sharp blade, after stabbing his abdomen, he should still have the power to resist. Therefore, the killer likely stirred it hard after encountering resistance. The victim felt pain, the resistance decreased, the killer pulled out the knife and stabbed the neck directly, causing the victim's trachea to rupture, blood to surge into the lungs, and death by mechanical asphyxiation."

"In this way, the location where the deceased was found is the place of body disposal, not the first scene?" Li Guangnian said and started to simulate the actions Jiang Yuan said, with a face of grief.

Jiang Yuan nodded, and by the way, explained to Li Guangnian next to him: "Forensic anthropology is still relatively niche."

If you treat every bone of the human body as a month of life cycle, checking more than 200 bones of the human body is like examining more than 200 months of a person's life, seeing where the problem occurred in these 200 months, and even the cause of death.

Like the right 8th rib, it's like looking at the 8th month of a person's 15th year of life. On this day, he encountered a major setback and left a trace.

Corresponding to the bone, this is a scratch.

For a forensic doctor, finding this scratch is one thing, judging the nature of this scratch is another, and finally confirming that it is a knife mark is not as easy as imagined.

The corpse is exposed to the outside, and it is inevitable to encounter various challenges. Insects, rats, birds, stray cats and dogs, etc., may all violate the corpse. It is not that you can judge it as a sharp weapon injury just by seeing scratches.

Li Guangnian naturally understood Jiang Yuan's explanation and smiled: "In this case, we actually invited other experts, but none of them analyzed it as clearly as you. At that time, the experts also praised Xiao Shen, saying that the young man protected the scene well, but it happened to be a rainy day..."

Jiang Yuan didn't continue the topic of other experts, turned his head and said: "I think this case can try to start with the murder weapon."

Li Guangnian hurriedly said: "Please tell me."

Jiang Yuan: "First of all, the form of this case doesn't look like a long-planned murder, and it's not as clean and neat as the other two rainy night cases. Therefore, this case can be considered as the killer's more elementary state, while the two cases behind, at least from the perspective of technique, look more like an upgrade. Of course, the gender of the victim is different, and the resistance intensity is different..."

"Changing gender can also be a way of upgrading." Liu Jinghui interjected at this time: "Only after killing people do you know that killing women is easier than killing men."

Several people present nodded lightly.

Jiang Yuan then said: "Looking at it this way, the killer's murder weapon might not be a very professional tool. I will go back and continue to draw to determine this. Now, I suggest focusing on investigating the victim's life traces in the days before death, the people he contacted, etc..."

(End of chapter)