Profiler 2: Criminal Investigation Brigade

Jiao Yang sighed, approached, and saw a little stain on the hem of the child's sweater.He said to Tao Xiaoyu: "Look again, what is this?"

Tao Xiaoyu checked and said: "Fortunately, there is a rainproof cloth to cover it, so it is not soaked by water, but this mark does not look like blood, it seems to be oil stains."

Hou Xiyong said: "Boss, you caught me again, should we go around? Maybe it will be the same as last time, and we will be able to catch the murderer!"

"It's not that easy."

Jiao Yang looked around and said: "This area is very empty, and there are no commercial streets around. Moreover, this child was lost at home."

Hou Xiyong said in surprise: "What is it, I lost it at home?!"

It is inconvenient for Jiao Yang to reveal the details of the case at this time, so he nodded and said, "Let's talk about it when we go back."

After conducting a routine search and comparison, the Fourth Criminal Investigation Team sent a copy of all the files of Li Yiyi's case.

Li Jianxi and his wife heard the news and came to recognize him immediately.The two are middle-aged daughters. Li Jianxi is 47 years old this year, and his wife Wang Yaru is not much younger than him.

After ten consecutive days of torture, both of them have aged a lot.Li Jianxi's face was ashen, and Wang Yaru's spirit was close to collapse when he saw the unrecognizable child. He fell down and sat down on the ground, crying heartbreakingly and chokingly, "Xinxin, look at mom, look at mom again! You Tell mom, who hurt you?!"

"Yaju, Yaru, let's get up first!"

While comforting his wife, Li Jianxi tried his best to help her up.However, he tried twice, but he couldn't pull Wang Yaru back. In the end, the two of them sat on the ground together, crying bitterly.

A man in his 50s and [-]s with a successful career, completely disregarding his image, sat on the ground and wailed. This scene is unavoidably heartbreaking.Even Hou Xiyong couldn't help saying: "It's a crime, it's a beast to attack such a young child!"

According to the previous police records and investigations of the fourth team, Li Jianxi's family lived in a dormitory of the Academy of Agricultural Sciences.Although the community is relatively old, but fortunately, it is located in the city center and the transportation is convenient.

9月8号周日下午，孩子1:40独自出门，去附近的兴趣班学画画，兴趣班是从2:00~3:30。李壹3:40分，出现在小区大门处的监控里，从门口进入小区。

However, the child's mother, Wang Yaru, had been cleaning the house at home, waiting and working, but the child did not come back.Wang Yaru thought that the school had extracurricular activities, but didn't care at first.When it was almost 5:00, she called the child's mobile phone, but found that it had been turned off and no one answered.

Wang Yaru panicked immediately, and called the teacher of the interest class to find out that the child had already gone home.

Wang Yaru immediately called Li Jianxi who was working overtime, and at the same time rushed to the community police station to call the police.Because the child disappeared for a relatively short time, the police made a registration, but the case has not yet been accepted.

Li Jianxi hurried back home from his work unit, and the couple searched everywhere in and around the community.The child's 70-year-old grandparents are at home, constantly calling teachers and classmates.

However, nothing was gained overnight.The teachers and classmates who are usually familiar with the child have reported that Li Yi has not looked for them.

Early the next morning, the police station officially accepted the case and began to investigate the monitoring along the way from the dormitory of the Academy of Agricultural Sciences to the cram school.Then, it was strangely discovered that Li Yi had time to go back and forth.But a few days later, Li Yi's body miraculously appeared on the hillside in the outskirts of the city.

Jiao Yang said: "The child has a phone watch. After finding out that the child is missing, the parents are flustered and fail to check all the information on the phone watch at the first time. Afterwards, the parents use the APP to check and find that the last location before turning off the phone was at In the family dormitory building. However, limited by the current communication technology of phones and watches, it can only be located in this community, and there is no way to go into more detail.

At present, it is very likely that the child was killed after returning to the community where the family lives.However, because the dormitory building is old, the property is filled by retired workers.In the entire community, there are only cameras at the front and rear entrances, and there is a side door in the hidden place in the middle, which is a loophole.

There is no public camera installed between each unit and the community.Only individual households install the camera at the door of the family.In other words, the community is full of monitoring dead ends.The surveillance that has been found so far shows that the murderer did not shoot the murder, nor did the suspect take the child away. "

Zhang Xianning said: "Since this is the case, it is possible to accurately avoid surveillance. At the same time, it is highly likely that an acquaintance commits the crime if the child is caught in the short time between returning to the community and home."

Lu Yuanli said: "Attacking such a young child is either to vent your perverted desires, or to seek revenge."

Jiao Yang nodded and said, "Then, the focus of our reconnaissance this time is the Li family. With the Li family as the center, it radiates to a radius of three kilometers, including the Academy of Agricultural Sciences."

Lu Yuanli thought for a while and said, "I don't know if you have noticed a detail? The child's mother said that when she called the child's mobile phone at 4:00 or 5:00 that afternoon, she found that it was turned off.

Let's imagine the scene at that time, the murderer committed the crime in the family courtyard of all acquaintances.The child's mother is also very aware of her get out of class time.

In this case, if the child's mother finds out that she did not return home on time, the first reaction should be to call the child's phone watch as soon as possible.

According to the consideration of confusing the line of sight and interfering with the police, the best option may be to mute the phone and watch, randomly select stray animals, and let them walk around wearing the watch.Or throw it on the bus, subway, taxi, and other public transportation. "

Jiao Yang immediately understood what he meant, nodded and said: "But in this way, there are three hidden dangers. First, if the murderer is not familiar with the phone watch, he cannot instantly mute it. Once the phone rings, the unique ringtone of the child's phone , it may attract the attention of others, resulting in the possibility of exposure.

Second, luring and catching stray animals must be done outdoors.The target is too big, there is a high probability of being scratched and bitten accidentally.And that day is Sunday, there are likely to be children who, out of curiosity, will catch small animals with phone watches, and their parents will find them or hand them over to us, which may lead to faster exposure of the case.

Thirdly, given the public security situation in Shanghai, all kinds of public transportation are basically equipped with surveillance cameras, and if they are photographed, they will become ironclad evidence of the crime.Therefore, in a panic, most murderers choose to shut down the phone immediately. "

Lu Yuanli glanced at him and said with a smile: "So, the shutdown time of the phone and watch that day is likely to be the time when the child was killed. But I don't know much about this kind of mechanical equipment, so I don't know if I can find out and turn it off accurately. time?"

"can!"

Jiao Yang said happily: "You reminded me, I'll ask them to investigate!"

Mo Ke and Zhou Ying immediately issued a certificate and went to the communication operator of the mobile phone card used by Li Yi to investigate the exact shutdown time of the mobile phone that day.

The time when the mobile phone is turned on and off involves mobile phone registration. Naturally, detailed time records can be found on the core network of the operator.

Because the mobile phone is connected to the Internet, there is a registration process.A mobile phone with a SIM card inserted must register with the operator's network when it is turned on. Similarly, it will also initiate a shutdown registration with the network when it is turned off.This is why when we dial a mobile phone number, we will hear the prompt tone "The phone you dialed is turned off".

After inquiry, it was learned that the exact shutdown time of Li Yi's phone and watch was 3:51 that afternoon.

This is likely to be the exact time when the child was killed.That is to say, the child was killed within 10 minutes after returning to the family home.

Everyone in the task force had a solemn look on their faces.Jiao Yang said: "However, this also confirms from the side. Our previous speculation is that the crime may be committed by an acquaintance. A 12-year-old girl already has considerable discernment and self-protection awareness. She will not easily go with strangers. In this kind of old-fashioned family home, the sound insulation equipment is usually acquaintances, as long as the children call for help, it is likely to attract the elderly from various families to come out to visit."

In the afternoon, Jiao Yang brought Hou Xiyong and others, as well as a non-staff Lu Yuanli, to Li's house.Considering the victim's emotions, Jiao Yang divided into three groups, Hou Xiyong, Yu Xiaoguang and Mo Ke, to re-investigate the surveillance video and visit the masses.He, Lu Yuanli and Zhou Ying went to visit Li Jianxi and his wife.

As soon as Li Yi disappeared, Wang Yaru asked for a long vacation with the unit.As a result, the child was not found, but Li Yi's body was found.Li Jianxi also went through the formalities at his work unit and took a temporary vacation to adjust his mood with his wife who was emotionally broken.

Li Jianxi came out and opened the door. As soon as Jiao Yang and the others came in, they saw a fruit basket and two cups of milk piled up on the coffee table in the living room.Wang Yaru leaned on the sofa with a disheartened face.

Jiao Yang asked casually, "A friend sent it?"

Li Jianxi said: "A junior in the unit, you have a heart."

Jiao Yang nodded and said, "I understand the two of you are feeling now, and you may not want to mention some things. But in order to give the child justice, we still have to ask."

Li Jianxi said: "Just ask, I will tell you what I know, as long as we can solve the case, catch the murderer, and avenge the child, we are willing to do anything!"

At this time, Wang Yaru sat up and nodded solemnly, "Speak, police officer."

Zhou Ying was in charge of recording and video recording, while Lu Yuanli was watching from the side.

Jiao Yang asked slowly: "According to the analysis of the property's video surveillance video, the place where the child was killed is likely to be in this community..."

"how so?!"

Wang Yaru shouted out of control: "Then if I go to pick up the child, or pick her up, won't this happen? It's all my fault! I thought the child would be back in a few minutes because we were so close. What's the matter, why is this happening?!"