Back at the city office, it was already past five o'clock in the morning.

Sun Jianzhong was temporarily detained, and his DNA was sent to the technical department for comparison.

The investigation of the case has also come to an end for the time being.

Ma Jingbo asked everyone to go to the dormitory to rest for a few hours, and then continue to investigate the case at 10 o'clock in the morning.

Ma Jingbo's proposal was unanimously approved by everyone, and the dormitory of the Municipal Public Security Bureau was very close, just a few steps.

Rao poured strong tea and coffee all night, Han Bin's brain was also a little sunk, it was still necessary to sleep, what to rely on to investigate the case if his brain was not bright.

The conditions of the dormitory are naturally not as good as those at home, two people in one room, Han Bin and Bao Xing in one room, Wang Xiao and Jiang Yang in one room.

Han Bin didn't even bother to take off his clothes, so he fell asleep while lying on the bed.

At 9:45, Han Bin's mobile phone alarm clock rang.

Everyone washed up and rushed to the office at ten o'clock.

Huang Qianqian has already bought breakfast for everyone, two meat buns, a tea egg, and a bag of milk per person.

Ma Jingbo yawned, peeled tea eggs, and said over and over again, "Let's discuss the case while we are eating." ”

"Just now the technical department sent a report, the DNA of the truck driver Sun Jianzhong and the DNA of the victim do not match, he is not the murderer we are looking for. ”

"As for why the deceased's mobile phone was in his car, I have two guesses, the first is that he is also a person involved in the case, deliberately covering for the murderer. Second, he had nothing to do with the case, and the murderer deliberately threw his mobile phone into his car in order to interfere with the police's sight. ”

"Personally, I'm more inclined to the second option. ”

Li Qin asked, "Horse team, do you have fingerprints on your phone?"

"Except for some sand, the phone is very clean, and no fingerprints have been found. ”

Bao Xing ate breakfast and said vaguely, "Doesn't that mean that the murderer is playing tricks on us, deliberately throwing his mobile phone on the car transporting sand and soil, so that our police can follow and toss." ”

Ma Jingbo concluded, "This suspect has a certain sense of anti-reconnaissance, and everyone should pay enough attention to it, so as not to be led by his nose again." ”

Han Bin wiped his mouth, "If the suspect has a certain sense of anti-reconnaissance, why should he leave genetic material in the deceased's body?"

Ma Jingbo said, "Eh, that's a good question, what do you think?"

Li Qin said, "I think there are two situations, the first suspect is an outlaw, he doesn't care at all, he enjoys this primitive possession more." The second type of suspect is very confident, and even if the genetic material is left, the police will not be able to compare success. ”

Wang Xiao said, "In fact, even if the DNA cannot be compared successfully, it can also provide us with some useful information, for example, among the suspicious people who appeared at the time of the crime last night, there are men and women, and it is obvious that the male surname is more suspicious, and you can start the investigation with the male surname first." ”

"It's also possible that a gang committed the crime. Lin Qin said.

"Even if it is a gang crime, the same male surname is more suspicious, otherwise it is impossible to leave genetic material, and whether there is a female surname or not is still between the two. Wang Xiao said.

Han Bin finished eating a tea egg in two bites, and it was very energy-consuming to use his brain, he went through the case from the beginning, walked to the whiteboard and wrote a few words,

"The deceased, the murderer, the informant, the police. ”

"The deceased was first electrocuted, then killed by the murderer, and then assaulted by the surname. After the killer left, he reported the deceased and called the police. That is to say, before the police arrived, it was known that two people had been to the scene, the murderer and the informant. ”

"During this period, the victim suffered three kinds of injuries, and we instinctively connected the three injuries together, thinking that the same person did it, but if it wasn't the same person. ”

"It could be simpler, corona injuries can be ignored for the time being, and only the last two injuries can be considered, homicide and corpse. ”

"Suppose that after the murderer killed, he did not violate the deceased, but left the swimming pool directly. At this time, a man entered the swimming pool and saw a woman in a swimsuit lying next to the pool, would he not help but have evil thoughts. ”

Although Han Bin said it more tactfully, everyone present understood that if the murderer did not leave genetic material, then only the security guard had a chance to commit the crime.

Ma Jingbo immediately said, "Qianqian, you check the security guard, whether there is any information about buying tickets or plane tickets." ”

"Yes. ”

Huang Qianqian directly clicked on the police system, entered her account number and password, and easily found the ticket purchase information of the security guard.

"Yes, he bought a plane ticket to Quincy at twelve o'clock today. ”

If it was just Han Bin's speculation before, then now there is a certain basis.

Bao Xing smashed his mouth, "Tsk, this guy is quite good at choosing a place and finding a place with beautiful scenery and spring all year round." ”

Ma Jingbo got up, "Don't be poor, hurry up and arrest someone." ”

If you really want him to fly to other places, and then change to other means of transportation, where to find it in a few cities?

Ten minutes later, Han Bin led a team to the airport to arrest Liu Yongshan.

Han Bin's suspicion of Liu Yongshan was accumulated little by little.

Last night, when Han Bin made a record for Liu Yongshan, he found that the other party was a little nervous, at that time, Han Bin thought that the other party had seen a dead person for the first time, and it was normal for people to be nervous.

Later, when the autopsy results came out, the victim was violated by his surname after death, which made Han Bin feel that something was wrong.

The victim has obviously been electrocuted, and the murderer really has bad intentions, so he can attack the victim at this time, and there is no need to kill him before doing it.

The third suspicion is that the murderer threw his mobile phone on the truck transporting sand, which diverted the police's investigation attention, indicating that the murderer had a certain sense of anti-reconnaissance and was unlikely to leave genetic material.

And Huang Qianqian checked Liu Yongshan's ticket purchase records and found that the other party had bought a ticket to Quincy, and the intention to escape was already obvious.

With Liu Yongshan's ticket purchase information, it is not difficult to arrest him, and Han Bin thought of a way to arrest him in the car.

In fact, Han Bin has a bolder guess, whether Liu Yongshan will be the real murderer, although this possibility is not large, but it cannot be completely ruled out, and the arrest also needs to be completely certain.

The arrest process was very smooth, and after the security inspectors did a security check on Liu Yongshan, Han Bin and others swarmed Liu Yongshan and surrounded him.

After seeing Han Bin and the others, Liu Yongshan was already stunned, and he couldn't speak.

As soon as he saw this appearance, Han Bin knew that there must be something wrong with him, so he directly asked people to torture him, and when he was escorted to the car, Liu Yongshan's legs were weak, and he had a little trouble walking, and he was carried into the car by Bao Xing and Jiang Yang.

After returning to the city bureau, people from the technical department collected Liu Yongshan's fingerprints.

Then Han Bin struck while the iron was hot and took him to the interrogation room.

The personnel in charge of interrogation were Han Bin, Jiang Yang, and Bao Xing.

When Liu Yongshan entered the interrogation room, he lowered his head and couldn't see his expression clearly.

"Bang bang. Han Bin knocked on the table, "Raise your head." ”

After this escort, Liu Yongshan seemed to have regained some courage, and forced a smile, "Officer Han, why did you bring me to the police station, I bought a ticket to go to other places, didn't you delay me." ”

"Now that I know that you're delayed, why don't you say anything about the airport?" Han Bin asked rhetorically.

"I didn't think much about it at the time. Liu Yongshan lowered his head.

"It's not that you don't think about it that much, but you're frightened. Han Bin said coldly.

"Yes, it's my first time flying, so I'm a little scared. ”

"Okay, you're still pretending to be here. Han Bin walked to the front of the desk and stared at him sharply, "Liu Yongshan, we have arrested you, but we have enough evidence, even if you refuse to recruit, we can still convict you." ”

Liu Yongshan took a deep breath, "I'...... I don't know what you're talking about. ”

Han Bin saw it when he was at the airport, this Liu Yongshan was not very bold, and said tentatively, "Liu Yongshan, don't pretend, you are the murderer who killed Li Yuan." ”

"I didn't. Liu Yongshan shouted.

"You went to the swimming pool that night and found Li Yuan swimming alone, and saw that she was beautiful and wore few clothes, so you had a bad idea, and corona her with an electric baton, and then carried out the surname assault, in order to prevent her from calling the police, you didn't stop killing her. ”

"You are planting, I didn't do it at all, I didn't have an electric baton, and I didn't kill Li Yuan, when I went, Li Yuan was already dead. Liu Yongshan pleaded loudly, for fear that Han Bin would put all the charges on him,

"You can't do this, it's not right for you, I'm not killing anyone. ”

"Why didn't you kill anyone?" asked Han Bin rhetorically.

Liu Yongshan showed a tangled look, and finally sighed and said, "Last night, I saw the lights on in the swimming pool, so I walked in, and saw the girl lying by the pool, so I checked it, she was no longer breathing, but she still had body temperature, I tried to save her." ”

"I was holding her chest, and she was wearing a bikini, which was so beautiful...... I thought she's dead anyway, and no one knows, and as long as I can control it, no one will know. ”

"I was so excited, I didn't control it, I knew I had made a big mistake, I was afraid that the police would catch me based on DNA, so they pushed her into the water, I thought maybe this would destroy the evidence, and the police wouldn't be able to find out......"

Bao Xing's face was serious and he asked, "What do you do?"

Liu Yongshan said timidly, "Security, I'm the security guard of the stadium." ”

"Phew!" Bao Xing took a sip, "You're really embarrassed to say, just like you, are you still a security guard, do you understand the meaning of security guards? ”

"I'm just a ghost, if that girl was still alive, I wouldn't be like this at the time, I just couldn't hold back for a while...... I know it's wrong, and I'll change it later!"

Bao Xing snorted and said disdainfully, "Don't worry, when you go to prison, there is time to reflect slowly." ”