"The offender is 212 years old, male, thin, between 1.73 and 1.75 meters tall, from an average family, has no regular job, but has work experience in many places, should be a work-study student, and has a slight cleanliness habit. The relationship with all the victims is familiar, using acquaintances to make the other party let down their guard, and then using dimethyl ketone to suffocate the victim to death, and then deboning and throwing the body. ”

Xu Ziqian added: "Music students, the previous bone throwing case was also committed by the same person. ”

The words of the two of them were shocking, but they didn't expect to solve two cases at once, and the murderers of two different serial cases turned out to be the same person. Although they have seen Ding Xiaoqian's ability, some people can't help but ask: "How are you sure?" ”

Because Ding Xiaoqian had a fever and had a dry throat, Xu Ziqian opened his mouth instead of her, issued a few orders, proposed several directions for investigation, and finally emphasized the things that need to be paid attention to. After looking at Ding Xiaoqian, the latter nodded, indicating that he had nothing to add.

He thought of everything she could think of, and there were a few things that were more detailed than she thought. In the end, it is the master, and the experience of handling cases is more than her.

"The above is the evidence, whether it can be finalized depends on the results. Until then, don't startle the snake! ”

The entire police station began to be fully mobilized, and several parts began to carry out the investigation simultaneously. Soon, all the evidence that Ding Xiaoqian said was presented in front of everyone one by one. But even at this time, they still can't determine the ultimate murderer, after all, there are many people who meet the above points.

Ding Xiaoqian looked at the evidence in his hand, a somewhat weak smile appeared on his pale and bloodless face, and nodded towards Xu Ziqian. After the latter received her instructions, he immediately issued an order: "Apply for an arrest warrant and arrest Cao Yunpeng immediately." ”

Everyone was in an uproar, and the president of Sun Yat-sen University, who had received a call in advance and rushed to the police station, was even more surprised and almost fell off his chair. She was the first to jump up and retort: "This is impossible, Cao Yunpeng is definitely not a murderer!" ”

Ding Xiaoqian gulped rock sugar pear water to moisten his aching throat, knowing that this group of people was definitely unwilling to hear the detailed analysis process.

She put the evidence on the slide in turn, and explained it simultaneously: "According to the footprints at the scene and the traces of the corpse, we can judge the height, weight, approximate age and shoe size of the murderer, and conclude that the murderer is 212 years old, between 1.73 and 1.75 meters tall, thin, and wears shoes of size 42." Cao Yunpeng conforms to this.

Second, ignore the bone throwing case and look at a few bone removal cases separately, the murderer murdered the victim, and after the bone removal, he will redress the victim, what does this mean? It shows that the murderer is ashamed of this matter, and if he is a person who usually does no evil, he will not have such a relationship. And only a usually kind person will have a feeling of guilt. Cao Yunpeng conforms to this. ”

The second reason sounded a little reluctant, and the president of Sun Yat-sen University immediately retorted: "This point is too far-fetched to justify." ”

Ding Xiaoqian glanced at her, knowing that she couldn't accept the fact in front of her, and said with a slight bow: "I'll explain this problem to you later, and we'll look down." ”

She changed a few pieces of information, clicked on the above investigation results and said: "There has been an incident of drug theft in the Anxin Nursing Home, and Cao Yunpeng happens to be working in the Anxin Nursing Home, and we have reason to suspect that the drug theft was done by Cao Yunpeng." Here is our specific analysis report on the dimethyl methyl ketone used by the murderer, the ingredients in Hu Tingting's body and the ingredients in Dong Wanxing and Zhou Tao's bodies are slightly understood, the ingredients in Hu Tingting's body are the same as the ingredients of the medicine lost in the Anxin Nursing Home, and the dimethyl methyl ketone in Dong Wanxing and Zhou Tao's bodies contains more impurities. According to the analysis, these impurities are produced during the artificial extraction of dimethyl methyl ketone, not by industrial extraction and separation. Therefore, the murderer knew the technology of extracting dimethyl methyl ketone, and had the opportunity to obtain the dimethyl methanol used in the extraction of dimethyl methyl ketone, which most often used as an antifreeze and an additive for blending gasoline, and Cao Yunpeng happened to have these work experiences. ”

She took a big sip of rock sugar pear water, waited until her throat was less sore, and then continued: "A variety of work experiences indicate that the murderer does not have a fixed job, and at the age of 212, he has no regular job but has a lot of work experience, and those who have engaged in a lot of work experience can only be work-study students." Cao Yunpeng also agrees with this. Of course, it is not excluded that people from other places come here to work, which will be used as a reference for the time being, and I will talk about why it is related to Cao Yunpeng later. ”

"The murderer portrayed the three bones separately in the bone throwing case, venting his hatred, and in the bone removal case, he specially selected students with excellent character and learning, indicating that the murderer had emotional cleanliness. It should be noted that in the case of bone throwing, the killer chose to discard the bones completely, while in the case of bone removal, the killer chose to leave part of the bones. Moreover, judging from the use of the murder weapon in the guò bone throwing case, the murderer's dissection skills have reached a very skillful level. Although this point cannot directly prove that the murderer is Cao Yunpeng, we must pay attention to the most important point. ”

She snapped and clicked on a few pieces of information in a row, and there was a wave on the slide: "The murderer and all the victims know each other, and he and the three victims in the deboning and corpse dumping case met at the music and cultural exchange festival in March this year, because they have a common hobby and language, which makes them familiar people." Of the three people in the bone throwing case, Cao Yunpeng has worked for the contractor's subordinates, worked in the same dance hall as the dancer, and he is also Hu Zhihai's illegitimate son. According to the victim's identity investigation, the common denominator of these people is music, and the murderer also started from this aspect. ”

"Do these relationships alone mean that he is the murderer?" This time, it was not the president of Sun Yat-sen University who spoke, but Fang Qin from the Xiaoshan City Police Station, who raised her own question: "At the same time as Hu Tingting's death, Cao Yunpeng was having dinner with you, and I saw him when I went to the hotel to pick you up." ”

Ding Xiaoqian coughed twice and nodded: "This is the wrong direction to mislead me in the first place." I simply attributed the damp clothes on Hu Tingting's body to her that she had encountered a heavy rain before, and even focused my attention on Liulishan City. But then when Zhou Tao was killed, I realized that I was going in the wrong direction. The clothes on the victim Hu Tingting's body were wet not because she had experienced a heavy rain, but because her body was originally wrapped in ice, which melted into water and soaked her clothes. I don't need to say much about the role of ice cubes, as everyone knows, it can delay the proof of death time. Cao Yunpeng cleverly took advantage of this, making Master and I indirectly witnesses in his absence. ”

"And ......"

She spoke again, and everyone couldn't help but widen their eyes, is there still one?

Ding Xiaoqian cast his eyes on Xu Ziqian's body, her throat was so painful that she didn't dare to speak more, she felt like she was about to explode all at once.

Although Xu Ziqian and Ding Xiaoqian did not communicate in advance, they knew what the other party was thinking just by the eyes between the two. And years of experience in solving problems made Ding Xiaoqian's heart clear when he said these reasonings.

He stood up, took Ding Xiaoqian's previous words and continued: "Let's first talk about the murderer's modus operandi. He asked the victim to relax his vigilance and vigilance against him, and then fed the victim dimethylmethyl ketone, which can suffocate to death, and then used a boning knife as a murder weapon to remove part of the victim's bones, and then threw the body. ”

He turned, looked around, and asked the most crucial question: "I would like to ask what kind of identity a stranger should be if several seemingly unrelated victims could trust the murderer and leave with him to the place that the murderer had arranged in advance?" ”

The answers given below are endless.

Couriers, taxi drivers, electricity bills, water meter checkers......