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

But this does not mean that the police's judgment was wrong. On the contrary, the ventilation duct found by Lu Chuan and his team on the rooftop should indeed be the passage for the suspect to enter and exit.

But the other party should be more cautious. He did not leave any fingerprints inside, so he was most likely wearing gloves. And according to Lu Chuan and others' judgment, the other party should have worn special non-slip gloves inside, because the entire ventilation duct is made of stainless steel.

The reason is that according to the description of that worker, they all have professional tools, so the marks on the dust cover of the ventilation duct were not left by him. When they repair it, no traces will be left during installation and removal.

A maintenance worker would not leave prying marks on the dust cover, so this mark must have been left by someone else, most likely the murderer of Tang Meijuan.

At the same time, we investigated the relevant situations of pure water and found some clues.

However, the clues were rather vague. They did find records of people buying this kind of mineral water in some convenience stores and supermarkets around Yuanfang Building, and after comparing them with the people in Yuanfang Building, there were overlaps. However, it was still too vague to determine who the murderer was based on this alone, and the workload was also very large.

It is a clue, but it is impossible to identify the suspect in a short period of time. In addition, some companies have purchased a large amount of this purified water internally.

If the suspect got the purified water from the company instead of buying it outside, then the situation investigated outside may not be of much value.

But the current situation is that no clue can be given up.

"We still need to continue to investigate and pull out a list of all the people in Yuanfang Building who have bought this kind of purified water in convenience stores and supermarkets outside, and then check whether there is any connection between them and Tang Meijuan. If there is no connection, we will put it aside for now. If there is a connection, we will investigate where he was on that day and whether he had any conflict with Tang Meijuan, or whether there was any financial dealings between him and Tang Meijuan. We will not miss any clues."

Although there are some suspicious points at the crime scene, there are no directional clues, so Lu Chuan plans to use traditional investigation methods and investigate bit by bit as long as there is hope.

And the first step is to copy back all the surveillance footage from the surrounding supermarkets and convenience stores. In this way, even if the case is not solved now, the evidence will be left behind, and by slowly identifying and studying it in the future, there will always be a chance that the case will be solved one day.

We can't wait until one day we suddenly discover a clue, and then the clue is pointed to by surveillance. Without this, it would be an omission, and the case would be flawed because the case was not handled carefully at the time.

On the third night after the incident, the relevant investigation work had come to an end, and the relevant teams from the Criminal Police Brigade were gathering together to discuss the next direction of investigating the case.

"Let me first report on the fingerprints in the ventilation duct. At present, the fingerprints in the ventilation duct have been ruled out. They should not be left by the suspect. After comparing these fingerprints with those of the worker who worked in the ventilation duct three months ago, they are indeed his. However, there is one thing that the hair we found in the ventilation duct is not a DNA match for the other party. It does not match."

"So my opinion is to conduct DNA tests on all the people working in the Yuanfang Building, and then compare them with the DNA information of this hair. It is very likely that we can identify the suspect."

This is the report of the on-site survey.

"Let me talk about my situation. I am responsible for investigating the various interpersonal relationships between Tang Mei and others."

Sun Biao spoke up. "From the current investigation, there is no conflict of interest between Tang Meijuan and the people in the engineering company. He is usually kind and low-key, and has good relationships with people. I haven't heard that he has any financial dealings or major disputes with anyone."

"Tang Meijuan had a boyfriend two years ago, but they broke up. When we checked the call records, we didn't find any contact between the two. And we contacted the other party by phone, and he left more than a year ago. He doesn't live in Haizhou City."

"So from the current investigation, the possibility that the other party died due to emotional reasons is actually relatively small. In addition, we found a clue during the investigation."

"When Tang Meijuan was having dinner with his friends, he mentioned that he wanted to buy a BMW or Audi, and he also said that he might buy a house by the end of this year."

"But I checked Tang Meijuan's bank statements and account balances. Her monthly salary is 6000 yuan, and her savings are less than 8 yuan. This amount may not be enough for her to buy a BMW or even a house."

"But following this clue, we investigated several BMW and Audi 4S stores in Haizhou City. We found out at the Dongjiao BMW 4S store that Tang Meijuan had inquired about the purchase of a BMW car, and she was asking about a 5 Series model, which was priced at more than 40 yuan."

"Tang Meijuan's monthly salary is only more than 6000 yuan, and the money she saved is only more than 8 yuan. With such a financial situation, how could she buy a car worth more than 40 yuan? And she is going to buy a house by the end of the year. I think this matter should be taken seriously and we can investigate from this aspect. At present, Tang Meijuan's death has nothing to do with love, and it can basically be confirmed that she was murdered. So I wonder if we can start from the financial aspect to investigate."

Everyone discussed this point.

"I think this direction is feasible. He doesn't have too many emotional problems every day, and he doesn't have any large expenses or income financially. But he actually asked his friend to buy a car, and even went to a 4S store to look at cars. So is he about to have a large income that can support him to buy a car or a house?"

"Don't forget that Tang Meijuan is the cashier of this engineering company. She has been working in this company for a long time. She was there when the company was founded."

"I think people who work in engineering know that there are many shady things going on. I think we should start with this engineering company. Did Tang Meijuan know some secrets of this engineering company, which led to her being silenced?"

"I agree. Let's check with this engineering company and see if we can find any clues."

Lu Chuan nodded after hearing this.

This is indeed a direction.

"How is the investigation going on in other areas, especially the ventilation duct?"

Chen Jiang stood up and said, "There is a clue, it's very big." (End of this chapter)