Serious Crime Unit 1

Chapter 121 The mystery of falling from a building (4)
After questioning Liang Xiaoping, they found that his words were very similar to Jiang Ru's, which was consistent with the facts. If the two men colluded to commit perjury, their words would definitely be highly consistent. Therefore, they judged that Jiang Ru and Liang Xiaoping were not lying.Obviously Li Huan did commit suicide by jumping off the building. However, both Jiang Ru and Liang Xiaoping said they did not hear the sound of Li Huan falling to the ground, which made Jiang Yiming and Xiao Ke feel strange. Falling from a height is referred to as a "high fall" in criminal investigation. The person on the 8th floor The height is generally about 25 meters, and the whole process only takes about 2 seconds. It is puzzling that Jiang Ru and Liang Xiaoping did not hear the fall to the ground in such a fast time. However, because they were 70 meters apart, could they hear it? To find out the sound of Li Huan falling to the ground, we need to conduct an experiment to find out.

Wu Jiang and Lu Yingying investigated the backgrounds of Jiang Ru and Liang Xiaoping. Their former colleagues and leaders all agreed that they were kind, honest, upright, and impossible to lie. There were no tainted records in their files. Jiang Ru had been arrested by many units. Awarded to an advanced individual for the first time, he is also a model worker in Jiangbei District. All signs prove that they are both good people.Although Jiang Ru and Liang Xiaoping lived together in Jinshan Community, they did not know Li Huan. Therefore, the crime team eliminated the suspicion of perjury between them.

The crime team decided to use a mannequin to test. The mannequin was a mannequin made of silicone. His weight, height, body shape, skin elasticity and other data were consistent with Li Huan. This was specially selected after Jiang Yiming weighed him. Simulated human beings are different from medical simulated human beings. Medical simulated human bodies are the latest technological products introduced to the market by the American medical community. They are specially used for medical research. The size, quality, density, texture, light perception, and The sound conduction properties are consistent with the parameters of the human body, and the internal organs, blood vessels, hair, nails, etc. are all available.Luo Jin's forensic room had medical dummies for men and women. Because they were expensive, Jiang Yiming was reluctant to use them to throw them down from the eighth floor, so he chose a silicone dummy.

At 11:30 p.m., the crime team drove to Jinshan Community. Xiao Ke and Wu Jiang took turns carrying the dummy, climbed up to the rooftop where Li Huan jumped from the building, and then put the clothes that Li Huan wore when he jumped on the dummy. To more accurately imitate the appearance of the crime, they erected the dummy and stood on the guardrail where Li Huan jumped from the building, waiting for Jiang Yiming's instructions.

Jiang Yiming and Lu Yingying came to the rooftop of Jiang Ru's house. Jiang Ru and Liang Xiaoping followed Jiang Yiming's instructions and waited there. After the four met, Jiang Yiming once again confirmed to Jiang Ru the time when Li Huan jumped from the building. Jiang Ru said the time when Li Huan jumped from the building. It was indeed 11:50, because he subconsciously looked at his watch.

Jiang Yiming nodded, pointed forward and asked, "Mr. Jiang, were the lights as bright then as they are now?"

"It's almost the same, except that the moonlight was much brighter than it is today." Because there was a layer of light clouds in the sky, the moon was missing one-fifth, so it didn't look as bright as that day.

"Can you see the people on the rooftop in front of you?"

"Of course. Two men on the rooftop in front are holding a man in white sportswear with both hands, standing on the guardrail where Li Huan jumped."

Jiang Yiming nodded, turned on the intercom, and said to Wu Jiang: "Old Wu, we are ready here. I will count to three, and you two push the dummy down hard."

"Ok."

Jiang Yiming counted 1, 2, and 3. Wu Jiang and Xiao Ke pushed hard and pushed the dummy down. Two seconds later, Jiang Yiming heard a not too loud "pop" sound. Jiang Yiming asked Jiang Ru and Liang Xiaoping if they heard it. ?They both said they heard it, which showed that they were both sharp-sighted, but why didn't they hear this more obvious sound that night?The most likely thing is that they were in a hurry to save people, which caused them to listen but not listen. In times of emergency, people will ignore other secondary things and only think about the most important things.

Jiang Yiming and Lu Yingying came to the rooftop where Li Huan jumped from the building, and met Wu Jiang and Xiao Ke. They turned on the spotlight and surveyed the rooftop and guardrails, hoping to find clues. However, after Li Huan died, residents of the community came to the rooftop one after another. Looking at it, the scene has been severely damaged. There are 182 different types of footprints on the rooftop and more than 60 types of fingerprints on the guardrail. It is almost impossible to find clues. What's more, if Li Huan committed suicide, the murderer was wearing a Gloves are used to commit crimes, and fingerprints are meaningless.It's just that Guo Chuan didn't protect the scene well at the beginning, but to be honest, it is rare for the criminal police to cordon off the scene of such a witnessed suicide case.Jiang Yiming asked everyone to pack up their exploration tools and return to the team.

The next day, Jiang Yiming convened a case analysis meeting, and everyone expressed their opinions. Xiao Ke, Lu Yingying and Luo Jin believed that Jiang Ru and Liang Xiaoping did not hear the sound of Li Huan falling to the ground because they were too anxious at the time.Wu Jiang and Jiang Yiming believed that the possibility that they did not hear the sound of falling was relatively small, because the sound of the dummy falling to the ground was 60 decibels, which could be heard by Jiang Ru and Liang Xiaoping.In the end, everyone reached a consensus: Li Huan's case may be a murder case and needs to be investigated in depth.

5. In-depth investigation

Jiang Yiming led the crime team to investigate Li Huan's residence. Yang Meihong followed Jiang Yiming's request and did not enter the house. Therefore, the scene was completely protected. They extracted four different footprints from the house.After comparison, the four types of footprints were those of Yang Meihong, Li Huan and Li Jun. The other was a stranger. Judging from the footprints, the stranger was about 1.70 meters tall and weighed about 60 kilograms. This kind of person is the most common in China. There are a lot of them on the street, so they are hard to find.The balcony of Li Huan's house is relatively large, 3 meters long and 2 meters wide. Because the security conditions of Jinshan Community are very good, residents above the fifth floor do not have anti-theft nets on their balconies. The balcony guardrails are made of iron art, European style and exquisite And concisely, Jiang Yiming stood on the balcony and looked from near to far for a while. Dingjun Mountain and Dianjiang Mountain stood majestically in the distance. Under the mountain were rows of high-rise buildings. Almost the entire provincial capital could be seen. No wonder Li Huan didn't Live in a villa and love living here.

Jiang Yiming withdrew his eyes and carefully searched for clues on the balcony. Under the railing on the left, he found a few drops of splattered sweat. He sprayed some liquid to dissolve the sweat, then dipped a cotton swab in it and put it into the evidence bag.

The entire investigation process took a whole morning, and the work was done meticulously. Even a tiny flake of skin on the ground was put into the evidence bag. There was no blood on the scene, but there was a small pile of vomit and 15 hairs next to the sofa. It was probably Li Huan's. left.

After testing by a laboratory technician, it was found that the vomitus indeed belonged to Li Huan and was completely consistent with the contents of his stomach. The hair was also Li Huan's. Judging from the amount of hair he pulled off, Li Huan may have encountered something very disturbing, which forced him to extreme despair. , leading to suicide.

However, the sweat stains at the scene did not belong to Li Huan, nor did they belong to Yang Meihong and Li Jun. So whose sweat stains could belong to them?Yang Meihong said that she could not remember who would sweat on the balcony of her home. Li Huan rarely received friends at home. Even if friends occasionally came to visit his home, it was impossible for them to sweat on the balcony because of the heat installed at home. Gree air conditioner.

Judging from the surface of the sweat stain: the sweat stain is fresh and cannot be more than 10 days old. Because the dust coverage on it is very light, the person who left the sweat stain at the scene is very suspicious.Luo Jin entered the sweat-stained DNA into the database to search, but there was no matching DNA in the database.

"Captain Jiang, we brought back the surveillance video of Li Huan coming home that night." Xiao Ke raised the USB flash drive in his hand and walked into Jiang Yiming's office with Wu Jiang.

"What did you find?" Jiang Yiming put down the document in his hand, picked up the water glass and took a sip of tea. Then he stood up and motioned for Xiao Ke and Wu Jiang to sit on the sofa.

"We found from the surveillance video that around 11 o'clock on the night of the incident, Li Huan was driven back home by a person. The car belonged to Li Huan. Li Huan must have been drunk at the time, so he was sent home with the car and the other people. According to that night The security guard on duty said: Li Huan was indeed sent home by someone. This person said he was a friend of Li Huan. The security guard said he had met him three times. This person introduced himself to the security guard and said his surname was Yang. Li Huan was drunk, so he sent him home. home, the security guard was very vigilant and followed Mr. Yang quietly. After seeing him park his car in the underground parking lot, he helped Li Huan go up to the 8th floor and entered Li Huan's home. After settling Li Huan, he left the community on foot and He took a taxi at the gate of the community and left. Shortly after Mr. Yang left, about 20 minutes later, the tragedy occurred that Li Huan jumped to his death."

"We must find Mr. Yang and find out in detail what happened to Li Huan that night. Maybe we can find a breakthrough from Mr. Yang. Xiaoke, call the security guard, ask the portrait artist to paint a portrait of Mr. Yang, and send an investigation report to all branches in the city. Go to the police station and find Mr. Yang as soon as possible. Wu Jiang, you and I will go to the traffic police team to check the traffic video to see where Li Huan came home from and where he drank."

Wu Jiang nodded, walked out with Jiang Yiming, started the car and drove towards the city traffic police squadron.

Jiang Yiming and Wu Jiang sat in the monitoring room of the traffic police squadron, called up the video on the night of June 6, and started looking back at the traffic video along the way according to the time. They watched the video from 15 monitoring points and sorted out the Li Huan’s driving route: Li Huan drove from Beixin Road to Huanshi Road, then turned into Futian Road, and then turned a few more turns before entering Jinshan Community. Mr. Yang was driving the whole way, and Li Huan was leaning on the passenger seat. superior.

(End of this chapter)