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

The blunt force injuries on the deceased were non-fatal, and the clothing was torn due to external force. No clues were found to identify the deceased. Samples of blood, stomach contents, and liver tissue have been sent to the laboratory for toxicology testing, and DNA samples have been sent to the laboratory for testing. The autopsy report will be finalized based on the test results.

Just as the preliminary autopsy report was completed, news came from the laboratory that the preliminary toxicology test results were in. Zhang Kai immediately picked up the phone to receive the lab report: "Forensic Doctor Zhang, we conducted preliminary tests on the extracted blood, stomach contents, and liver tissue samples. The tests revealed high concentrations of organophosphorus pesticides in the deceased's body, far exceeding the lethal dose. Our preliminary assessment is that the death was due to organophosphorus pesticide poisoning. We are still conducting further tests to determine the specific type and exact dosage of the pesticide, and we expect to have the final results around 10:00 AM. Additionally, no alcohol was detected in the deceased's body, ruling out alcohol poisoning."

After hanging up the phone, Zhang Kai's face turned serious. He said to Xiao Lin, "Xiao Lin, the preliminary test results from the lab are in. The deceased had a high concentration of organophosphorus pesticides in his body, indicating death from organophosphorus pesticide poisoning. The specific type and dosage of the pesticide should be available around 10 a.m. We'll immediately complete the autopsy report, adding the preliminary results of the toxicology test, and then report the autopsy findings to Captain Lu Chuan."

"Understood, Teacher Zhang!" Xiao Lin immediately got to work, completing the autopsy report based on the laboratory's preliminary test results, adding information related to poisoning to ensure the report's accuracy and completeness. Zhang Kai, meanwhile, reviewed the autopsy report again, and after confirming there were no problems, printed it out and signed it to confirm its accuracy.

At 6 a.m., the sky gradually brightened, and the east began to show the first light of dawn. After a busy night, Zhang Kai and Xiao Lin were exhausted, their eyes bloodshot, but they did not slack off at all. They prepared the autopsy report and related test samples and prepared to go to the Dongcheng Criminal Investigation Detachment to report the autopsy results to Lu Chuan.

At 7 a.m., Zhang Kai and Xiao Lin arrived at the Dongcheng Criminal Investigation Detachment. Lu Chuan had been waiting in the office for a long time. Wang Shuai and his team members had also arrived at the detachment and were sorting out the clues from yesterday's investigation. They looked tired, but their eyes were still full of energy.

"Forensic Doctor Zhang, thank you for your hard work. You haven't rested all night. How did the autopsy go? Have you determined the time and cause of death? Have you found any clues to prove the deceased's identity?" Lu Chuan immediately stood up when he saw Zhang Kai and Xiao Lin come in and asked anxiously. He knew that the autopsy results were crucial to solving the case and could provide a clear direction for the investigation.

Zhang Kai handed the autopsy report to Lu Chuan and said in a serious tone, "Captain Lu, after a night of autopsy and preliminary examination, we have determined the time and cause of death of the deceased. Now I will report to you in detail. The deceased was male, aged between 30 and 35, about 175 cm tall, of medium build. There were no obvious fatal wounds on the body surface, only a 3×4 cm blunt force wound on the forehead, dark purple in color, which was not fatal. There was a minor abrasion on the right wrist, and the clothing was torn, which was caused by external force."

"The autopsy revealed that the deceased's vital organs, including the heart, liver, spleen, and kidneys, showed no obvious damage or disease. There was no bleeding or contusion in the brain, ruling out organ damage, disease, intracranial injury, or asphyxiation as causes of death. Preliminary laboratory toxicology tests showed that the deceased's body contained a high concentration of organophosphorus pesticides, far exceeding the lethal dose. The preliminary judgment is that the death was caused by organophosphorus pesticide poisoning. The specific type of pesticide and accurate dosage are still under further laboratory testing, and the final results are expected around 10:00 AM."

"Regarding the time of death, considering the degree of digestion of the food in the deceased's stomach, the temperature of the scene, and the condition of the body surface—slightly cloudy corneas, initial formation of rigor mortis, and pale purple lividity—it is determined that the deceased died 2 to 3 hours before the incident, that is, between 11:00 AM and 12:00 PM on [Month] [Day]. The exact time of death will be determined based on the final toxicology test results."

Lu Chuan listened attentively to Zhang Kai's report, nodding as he reviewed the autopsy report, his brows slightly relaxed: "Good, very good. At least we've determined the time and cause of death, which is a significant breakthrough for the case. Organophosphate pesticide poisoning suggests that the suspect may have prepared the pesticide in advance, poisoned the victim, and then moved the body to the material storage area of ​​the subway construction site to cover up the crime."

"Forensic Doctor Zhang, have you found any clues that can prove the deceased's identity? Such as an ID card, mobile phone, wallet, or other items, or characteristics such as dental treatment marks or skeletal deformities?" Lu Chuan continued to ask, his tone full of expectation. Confirming the deceased's identity is one of the keys to solving the case.

Upon hearing this question, Zhang Kai's expression turned serious. He shook his head and said, "Captain Lu, unfortunately, we didn't find any clues to identify the deceased during the autopsy. The deceased's pockets were empty; there was no ID card, mobile phone, wallet, or any other items that could prove their identity. The deceased's teeth showed no signs of treatment, and there were no obvious bone deformities, making it impossible to confirm their identity through these characteristics. We have already extracted the deceased's DNA sample and sent it to the laboratory for testing. We will then compare it with the missing persons database to try to confirm the deceased's identity, but so far, there are no results."

Lu Chuan frowned again, a hint of disappointment on his face, but he quickly composed himself and said firmly, "It's alright. If we can't find any clues to the deceased's identity, we'll continue the investigation, adjusting our investigative approach based on the time and cause of death. Forensic Doctor Zhang, please get the final toxicology test results as soon as possible to determine the specific type and dosage of the organophosphorus pesticide. This will greatly help us in identifying the suspect. Also, speed up the DNA sample testing and compare it with the missing persons database to confirm the deceased's identity as quickly as possible."

“Understood, Captain Lu!” Zhang Kai nodded and said, “We will immediately communicate with the lab and urge them to speed up the testing process so that we can obtain the final toxicology and DNA test results as soon as possible. We will report to you immediately once we have any news. In addition, during the autopsy, we extracted fibers from between the victim's fingers, clothing fibers, as well as samples of blood and stomach contents. We will compare these samples with the trace evidence collected at the scene to see if there is any correlation, providing clues for solving the case.” (End of Chapter)