Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

The two knocked on doors and asked. Uncle Li on the third floor opened the door and looked at them warily: "There was a car parked downstairs in the middle of the night. I thought it was a scrap collector. But I didn't hear any movement and it drove away in the morning." Wang Shuai noticed the work clothes drying on the old man's balcony, with some blue powder on the cuffs: "Uncle, do you work in a chemical factory?" The old man nodded: "Yes, what's the matter?" Zhang Hui suddenly said: "Were you on night shift when the truck came?" Uncle Li scratched his head: "No, I took a leave that night... Wait! I remember!" He suddenly turned around and took out his mobile phone, "My dog ​​barked loudly in the middle of the night, I took a video, and it seems that the car was in it!"

In the video, a silver-gray truck was parked under a street light, with the license plate deliberately covered with mud. Wang Shuai held his breath and checked frame by frame: "Look at the dent at the position of the headlight, which is consistent with the slight collision mark described by the construction team!" But when they were about to conduct an in-depth investigation, the technical department sent a message: through the vehicle's driving trajectory modeling, the vehicle was refueling at a gas station in the south of the city at the time of the incident, and the surveillance clearly captured the driver's face - he was a formal employee of the municipal company.

Zhang Hui looked at the investigation report in his hand, frowning more and more: "Did we go in the wrong direction?" Wang Shuai stared at the densely marked points on the map and suddenly said: "Check the surrounding second-hand car markets and modification shops. Since the murderer forged the municipal paint, it is very likely that he obtained the vehicle from illegal channels." At the "Integrity Car Dealership" in the west of the city, the boss initially denied having seen a similar vehicle until Zhang Hui showed the search warrant. In the corner of the warehouse, they found half a bucket of unused silver-gray paint, and the color number exactly matched the vehicle in the surveillance.

"These paints were bought by a man wearing a mask last month." The boss wiped his sweat, "He also bought a sticker saying 'Municipal Emergency Repair'." Wang Shuai immediately checked the surveillance video. The man in the video was wearing a cap and deliberately avoided the camera. However, through gait analysis, he was highly similar to the suspicious person who appeared in the steel market before the incident. Following this clue, they visited three more auto repair shops and finally found key evidence in a remote modification factory - there were several discarded license plates with the word "Municipal" piled in the corner, and the wear marks on one of them were exactly the same as the details in the construction team's memory.

However, when they tracked the vehicle, they found that the fake silver-gray van had been sent to a scrapyard three days ago. The scrapping records showed that the person who sent the van used a fake ID. Wang Shuai looked at the wreckage of the vehicle that was flattened into a sheet of iron and suddenly realized that the murderer deliberately led them to track down the vehicle in order to consume police force and cover up the real vehicle for transporting corpses. Although it was confirmed that the silver-gray van had nothing to do with the case, it made them more convinced that the murderer had a strong anti-reconnaissance ability, and this cat-and-mouse game had just begun.

The shadowless lamp in the autopsy room cast a cold halo on the stainless steel table. Zhang Kai neatly arranged the last evidence bag containing the body parts. The pungent smell of formalin mixed with the stench of corpses filled the room. He adjusted his goggles, and the rubber gloves made a crisp sound when they collided with the metal instruments: "Begin the examination. Remember to record the body parts number and splicing position."

Assistant Xiao Chen quickly tapped on the tablet computer, and the autopsy record was updated in real time on the screen. Zhang Kai first used tweezers to pick up the right arm fragment numbered S-07. Under the strong light, the dark red livor mortis on the skin surface had turned into a fixed state: "Based on the depth of livor mortis infiltration and the hemoglobin crystallization in the blood vessels, the time of death was between 40 and 48 hours." He used a vernier caliper to measure the width of the wound, "The sawtooth cut surface, the wound edge is accompanied by a contusion band, the murder weapon should be a metal reciprocating saw of more than 30 cm, and continuous pressure was applied during the cutting."

When processing the torso of S-12, Zhang Kai suddenly stopped. On the right shoulder blade of the deceased, half of a faded swallow tattoo was faintly visible, and the blue pigment on the edge of the wings had turned a strange gray-green due to decay. "Take photos for archiving, and focus on marking the details of the tattoo." He took out a magnifying glass, "The tattoo was done with a single needle matte technique, and there is a partial halo, which means it was done at least five years ago. Contact the missing persons database to screen for women with the same tattoo characteristics."

The moment the scissors cut the ribs, the corrupt gas remaining in the chest cavity gushed out. Zhang Kai used a suction device to remove the effusion and observed the lungs: "Both lungs showed marbleization, and bloody foamy fluid was seen in the trachea, which was consistent with the characteristics of mechanical asphyxiation." He cut open the throat and found an obvious fracture on the left side of the thyroid cartilage: "The greater horn of the hyoid bone was fractured due to strangulation, and the force was concentrated on one side. The murderer was right-handed and applied force quickly."

When processing the skull numbered S-21, Zhang Kai found key evidence. There were three depressed fractures in the occipital bone, with neat edges and a quasi-circular shape: "These are fracture lines formed by blunt metal impacts, which are consistent with the characteristics of a hammer or similar tool. Pay attention to the intersection of the fracture lines. The fracture line of the second wound is cut off by the third, indicating that there were three consecutive blows." He extracted tissue samples from the fracture site to "test whether there is rust, and the murder weapon may not have been thoroughly cleaned."

"Captain Zhang, the results of the stomach content analysis are out." The technician handed over the test report, "The undigested food residues include glutinous rice and red beans, which are consistent with the ingredients of eight-treasure porridge. A small amount of kelp debris was found in the duodenum. Considering the degree of food digestion, the deceased's last meal was 2-3 hours before death." Zhang Kai added in the autopsy record: "Check the surrounding breakfast shops, focusing on those selling eight-treasure porridge and kelp soup, to narrow down the time range of death."

When handling the lower limb fragments, Zhang Kai noticed abnormal burn marks on the skin of the calf. He used a skin tissue sampler to cut the surface layer and put it on a glass slide: "Under the microscope, we can see cavitation of epidermal cells and coagulative necrosis of collagen fibers in the dermis. This is a second-degree burn caused by the splashing of high-temperature liquid. Testing the chemical composition of the burn site may reveal residual detergent used by the murderer to clean the scene."

When all the body parts were examined, Zhang Kai began to piece them together. On the dissection table, the scattered limbs gradually formed a human figure. He used surgical thread to suture the sections and measured the proportions of each part: "According to the length of the long bones, the height of the deceased is 165±2cm. The pubic symphysis is grooved and ridged, and the age is between 28 and 32 years old." He suddenly pointed to the left hand of the deceased: "The ring finger has an indentation left by wearing a ring for a long time, but there is no ring on the finger, which may be removed deliberately by the murderer."

When extracting the deceased's tooth samples, Zhang Kai found an important clue. The left maxillary second molar had a unique silver-mercury filling in the shape of an irregular triangle. (End of this chapter)