In fact, Li Jing and I did not go home, but went directly to Mr. Lu's house. Teacher Lu was not surprised when he opened the door and saw Li Jing, it is estimated that he was annoyed by Li Jing when he was in school before.

"The little couple is looking for me to help again?" Teacher Lu made a joke that was not funny at all.

"Mr. Lu, there are new results from the forensic doctor's side, judging from the knife wound and the method of disposing of the corpse, I suspect that the murderer may have been a military doctor before, and he should have had experience in battlefield rescue. However, from my side's investigation of the theater staff, there has been no suspect who meets this condition. The information on the theater was still asking Shi Hao to cross-compare with the people in the theater, and there was no intersection between the employees of the theater and the old theater. Li Jing briefly explained the situation.

"I've been thinking about the time when the body will appear for the past two days, if the murderer wants to yo the body is not found, he just needs to keep it on the top floor. If it's to get someone's attention, you should also let the time when the body land at the beginning or the end, or in the movie**, which is the best time to show off, but not long after you start, the body falls, which is different from the habits of ordinary murderers. Instead of hiding the body like ordinary murderers, it is like a serial killer who uses the body as a provocation to the police, because he has not received other similar cases, and it is difficult to determine the characteristics of the murderer. Teacher Lu held the teapot and wrote down Li Jing's words just now and his doubts on a piece of white paper, and drew a circle on the point of time, and marked a question mark by the way.

Li Jing looked at the question mark, looked up and asked Mr. Lu: "Mr. Lu is inclined to the murderer is a serial killer?" Glancing at Mr. Lu's noncommittal expression, Li Jing then asked, "Did Team Xiao tell the teacher about the reason for the fall of the body?" ”

"The results came out this morning. At first, Xiao Xiao and the others were very strange, and the team that investigated and collected evidence at the scene that day did not find any mechanism around to control the fall of the body. The dark room has been used frequently before, and there are drag marks of different shades on the floor of the dark room, but the investigators still found some new scratches, but there is no direct connection with the body sliding, it may be the scratches caused by the murderer's transportation, and the first investigation record gives the impression that the body has slid down on its own. This morning, when the team in charge of the crime scene investigation went to the scene to collect evidence, they found that the dark room on the ceiling was inclined with a certain slope, which was completely unnoticeable if a normal person was standing, but if a heavy object was placed on it, the heavy object would slowly slide down this slope. This screening hall uses stereoscopic surround technology, which is not used by people who often show movies nowadays, but if it is a theater, the choreography of many plays will make full use of the equipment in the darkroom to create the effect of wind, rain and snow. The use of these stereoscopic devices accelerates the rate at which the corpse slides. Later, Xiao Xiao and the others checked the control equipment in the screening room and found that the most recent time they used it was at 1:20 last Saturday. Mr. Lu drew a simple diagram for us on paper.

After listening to Mr. Lu's words, I remembered that when I watched a movie with Li Jing last week, I did feel as if something like water droplets had fallen on my neck, but because I was wearing thick clothes in winter, it didn't feel very real, so I didn't pay much attention to it.

"The reason for the fall of the body has also been identified, so now we can confirm that the murderer is from the army, participated in the field rescue, may be a military doctor, or may have been injured on the battlefield, familiar with the rapid treatment of injuries. Similarly, the murderer was familiar with the rooftop dark room left over from the previous theater, and it is possible that he was an employee of the troupe or participated in the renovation of the theater after retiring from the army. The person who can accurately grasp the timing, handle the corpse and monitor it must have enough body and at the same time understand the daily work of the theater. Li Jing summarized the information he and Teacher Lu had gathered.

"Team Xiao, the profile of the suspect has come out, you can organize a task force to issue the characteristics of the suspect. The person we are looking for is probably under the age of 40, has served in the military, has actual combat experience, and battlefield rescue experience, and has rich experience in emergency first aid. He is about 1.75 meters tall, sturdy, and has participated in theater performances or decorations. Also, the murderer is familiar with the operation of electronic equipment and the work of the theater, and the possibility of the theater staff is not ruled out. It can be found in all veterans in the city, including those who have recently moved into our place, and the murderers who meet the above characteristics can be compared first. Now Shi Hao is confirming the information of the third person who registered the monitoring account, and you can use it as a reference to determine the identity of the suspect. Originally, Li Jingjing was about to hang up the phone, but suddenly remembered something and added: "By the way, Team Xiao, has the identity of the deceased been confirmed?" It may be that he received a negative reply, and Li Jing looked sullen when he put away his phone.

"Didn't you confirm it?" I asked.

Li Jing nodded: "Not being able to confirm the identity of the deceased will affect our profile of his motive for killing, even if we catch him, we can't arrest him without biological evidence." If, according to Mr. Lu's inference, the murderer's actions are a provocation, then we still can't infer his next steps. If we continue like this, we will always be one step behind him until we find definite evidence to arrest him. ”

After a long time, Mr. Lu raised his head from the blank paper in front of him and asked us, "Why did you go there to watch a movie that day?" ”

Li Jing and I were obviously a little confused about what the question was, and finally I replied hesitantly: "Because it is very close to me and Li Jingjing." As soon as I finished speaking, it dawned on me, I glanced at Li Jing, and it seemed that he quickly understood what was going on.

"Teacher, do you mean that the deceased may have lived near the movie theater?"

"Well, it snowed on Saturday, and there was no shopping street or anything like that near that theater, so the audience should be people who live nearby. Even if he was not killed in the theater, he could have been killed by the murderer in an argument near the theater. Since no family members have reported missing, perhaps the deceased may not necessarily be a nearby resident, or the deceased lived alone. Let Xiao Xiao and them investigate whether there is anyone in the nearby hotel or rental house who has not been back for a long time, and they should be able to confirm the identity of the deceased. Calling up the surveillance near the theater, it was snowing that day, and most people chose to walk there, so it was easy to identify the deceased, and perhaps it was possible to take a picture of the deceased's appearance before his death, which can be used to determine the location of the deceased. Teacher Lu looked at his watch, it was almost twelve o'clock: "It's late now, why don't you get together with me for the night today, it's too late to go back." ”

I couldn't agree more, after hearing so many terrible things today, I would never dare to stay alone in the house, and after a busy day, I was also sleepy. Li Jing saw that I had no objection, and said thank you to Mr. Lu and decided to stay. After brushing my teeth, I came out and saw that Li Jing was calling Team Xiao again, and I was wrapped in a quilt and lay on the sofa, and soon fell asleep.