After listening to the medical examiner's words, I looked up at the ceiling above my head, and it was clear that there would be no place on this low classroom ceiling that would allow a person to suffer from a fall from a height.

"If that is ......," I scratched my head, contemplating the possibility of falling from a height.

"Team Shao, I don't think this is the first crime scene." The medical examiner looked at me and said.

"You mean, the deceased fell from a great height, and then his body was dragged here?"

I looked at the medical examiner and said.

"That's right. Otherwise, we can't explain why this man's face was clearly injured by a fall from a height. He was supposed to have fallen from a great height and died on the spot, and then his body was dragged to the fifth floor from somewhere else. ”

I shook my hand and asked, "But this is logically unreasonable, how could someone not only not report the crime after seeing someone fall from a height and die, but dragged the person's body to the classroom on the fifth floor?" ”

"Team Shao, there is a possibility," Ouyang Qian, who was standing aside, suddenly said:

"The person who dragged this body up is the murderer."

I spoke to her at the same time.

"But," the medical examiner interrupted us, and he offered his own opinion:

"The murderer, this is simply redundant. Let's start by assuming that this was a homicide, or an accident. So why did the person who caused this accident spend so much energy dragging the body from the ground floor to the classroom on the fifth floor? This is not the necessary behavior, and the whole process of dragging the body can also be discovered. ”

"Well, that makes sense. But in any case, this case should be tentatively characterized as homicide or accident. There is no such thing as suicide. No one would not have called the police and dragged the body upstairs after seeing the suicide. Unless, this person did not die after jumping off the building, but climbed up by himself, and by the way, he also cleaned up the blood stains on the place where he crawled. ”

The medical examiner shrugged his shoulders and did not speak again, but put away his tools and had the body carried out.

I walked alone to the classroom window and looked at the scenery. The sun is scorching outside, and although the whole classroom looks shady, I believe the indoor temperature here should not drop below 25 degrees. Many comrades were already sweating profusely because they still had to wear masks and gloves.

This was a comrade who came over and said to me: "Team Shao, the identity of the deceased has been confirmed, and we have notified his family to go directly to the forensic office of the police station to identify the body. ”

"Well, good. Read him who he is. ”

Zhang Yucai, male, 45 years old, is a math teacher at this school. He's been working here for almost a decade. We checked his profile on the school's official website and found that this person is a very good teacher, and he has won many awards in education. ”

"Teacher?" I asked, a little puzzled.

"That's right. It is said that this teacher is a very strict teacher, he is very demanding of his students and often gives them a lot of homework. In his opinion, learning is for grades, for scores, and if you don't have good scores and grades, you can't say that you are an excellent student. ”

The last words of this comrade made me feel a little funny. I turned my head to look at him and said, "How do you know that?" ”

"It's all on the official website! Team Shao, look. ”

After saying that, he reached out and handed over his phone. I took a look and found that there were several posts on the school's official website, all of which were written about this math teacher. What "strict teachers produce high apprentices" and "stick education" are all related to this teacher.

I silently thought in my heart: "Is it very likely that such a teacher will form a bond with some students?" In other words, it is also possible to form a bond with some of the students' parents. ”

In any case, the direction of our investigation is very certain, and it should be around the work and life of this teacher.

Now that the scope of our investigation has been narrowed down to this school, or even to the flight where the teacher taught, this is much simpler than some of the usual cases.

Suddenly, I saw the monitoring probe above the head of this classroom, and I felt a sense of relief in my heart.

"Okay, let's lock off the scene, let's go to the school's monitoring room to have a look."

It took a lot of effort to get to the school's monitoring room. Because the key to the control room is kept by the security guard, but it is now the security guard's lunch break, so we had to ask a few employees to help and ask them to run to the staff dormitory to ask a security guard with the key to come over.

The weather was really hot, and I looked at Ouyang Qian who was standing aside, she was already sweating profusely.

"Qian, it's too hot, go back first, maybe you're busy at the police station." I looked at her with concern.

"Hmph, I'm so vulnerable. Besides, Team Shao, haven't you gone back yet? Ouyang Qian looked at the beads of sweat on my forehead distressedly, and took out a tissue to wipe the sweat on my head for me.

"Don't wipe it. If you wipe it, you'll be covered in sweat after a while. I gently touched her cheek to show my gratitude.

After a few minutes, the security guard with the key ran towards us, and when he saw a group of uniformed policemen standing here waiting for him in the sun, he became even more anxious and couldn't help but speed up his pace again.

After opening the door, he retrieved the surveillance header at the time of the crime. According to the forensic investigation, the body had been dead for about an hour, and roughly calculated the time it might have been dragged from the bottom of the building to the roof, which was about half an hour.

So we took the surveillance video from 12 p.m. to 2 p.m. and looked at it from that.

When we moved the time to about two o'clock, a person appeared in the classroom. But this man was wearing a mask and a hat, so we couldn't see him clearly. But we could clearly see the thing he was dragging behind him.

That's Zhang Yucai's corpse!

He first placed the body on the podium, then sat down and rested breathlessly for a long time, then he stood up again and placed the body where we found it. That is, the location near the window.

It seems strange to me that the killer seemed to have deliberately placed the body near the window, but why? Did he do this for any particular purpose?