It was already five o 'clock in the morning when they returned to the Municipal Public Security Bureau.
Sun Jianzhong was temporarily detained, and his DNA was sent to the technical department for comparison.
The investigation of the case also came to an end.
Ma Jingbo asked everyone to rest in the dormitory for a few hours, and they would continue the investigation at ten o 'clock in the morning.
Ma Jingbo's suggestion was unanimously approved by everyone. The dormitory of the Municipal Public Security Bureau was very close, and it was only a few steps away.
Even after a night of strong tea and coffee, Han Bin's brain was a little heavy. It was necessary to sleep. If his brain was not working, how could he investigate the case?
The conditions in the dormitory were naturally not as good as at home. There were two people in a room, Han Bin and Bao Xing in one, and Wang Xiao and Jiang Yang in another.
Han Bin was too lazy to even take off his clothes, and he fell asleep on the bed.
At nine forty-five, Han Bin's phone alarm rang.
Everyone washed up and rushed to the office at ten o 'clock.
Huang Qianqian had already bought breakfast for everyone, two roujiamos, a tea egg, and a bag of milk for everyone.
Ma Jingbo yawned, peeled the tea egg, and said, "Let's discuss the case while we eat."
"The technical department just sent a report. The truck driver, Sun Jianzhong's DNA doesn't match the victim's DNA. He is not the murderer we are looking for."
"As for why the victim's phone was in his car, I have two guesses. The first is that he is also involved in the case, and he is deliberately covering for the murderer. The second is that he has nothing to do with the case, and the murderer deliberately threw the phone into his car to distract the police. "
"Personally, I am more inclined to the second."
Li Qin asked, "Captain Ma, are there any fingerprints on the phone?"
"Except for some sand, the phone is very clean, and no fingerprints were found."
Bao Xing ate his breakfast and said vaguely, "Doesn't that mean that the murderer is playing with us? He deliberately threw the phone into the truck that was transporting the sand, so that the police would follow him?"
Ma Jingbo concluded, "This suspect has a certain degree of anti-reconnaissance awareness. We have to pay enough attention to it, lest we be led by the nose again."
Han Bin wiped his mouth, "If the suspect has a certain degree of anti-reconnaissance awareness, why would he leave genetic material in the victim's body?"
Ma Jingbo said, "Hey, that's a good question. What do you guys think?"
Li Qin said, "I think there are two possibilities. The first possibility is that the suspect is a fugitive who doesn't care at all. He enjoys this primitive possessiveness. The second suspect is very confident. Even if he left his genetic material, the police will not be able to match it. "
Wang Xiao said, "In fact, even if the DNA comparison can't be successful, it can still provide us with some useful information. For example, among the suspects who appeared at the time of the crime last night, there were both men and women. Obviously, men are more suspicious, so we can start with men."
"It could also be a gang crime," Lin Qin said.
"Even if it's a gang crime, it's still more suspicious if it's a male surname. Otherwise, it's impossible to leave genetic material. It's still uncertain if there's a female surname," Wang Xiao said.
Han Bin finished the Herbal Tea Egg in two bites. Using his brain also consumed a lot of energy. He reviewed the case again, walked to the whiteboard, and wrote a few words.
"The deceased, the murderer, the reporter, the police."
"The victim was first electrocuted, then killed by the murderer, and then sexually assaulted. After the murderer left, he reported that he found the victim and called the police. In other words, before the police arrived, it was known that two people had been to the scene, the murderer and the reporter. "
"During this period, the victim suffered three kinds of injuries. We instinctively linked the three kinds of injuries together and thought it was done by the same person, but what if it's not the same person?"
"It can be simpler. The electrocution injury can be ignored for the time being. We only consider the last two kinds of injuries, murder and a healthy corpse."
"Let's assume that after the murder, the murderer did not violate the victim, 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 swimming pool. Wouldn't he have evil thoughts? "
Although Han Bin's words were tactful, everyone present understood that if the murderer did not leave any genetic material, then only the security guard had the chance to commit the crime.
Ma Jingbo made a prompt decision. "Qianqian, check if the security guard bought any train or plane tickets."
"Yes."
Huang Qianqian directly clicked on the police system, entered her account and password, and easily found the security guard's ticket purchase information.
"Yes, he bought a ticket to Quincy at noon today."
If it was just Han Bin's speculation before, then there was a certain basis for it now.
Bao Xing smacked his lips. "Tsk tsk, this guy is quite good at choosing a place. He found a place with beautiful scenery and spring all year round."
Ma Jingbo stood up. "Stop joking around. Hurry up and arrest him."
If he really flew out of the city and changed to other means of transportation, where would he find him in several 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 bit by bit.
Last night, when Han Bin was giving Liu Yongshan a statement, he noticed that the other party was a little nervous. At that time, Han Bin thought that it was the first time the other party had seen a dead person, so it was normal for him to be nervous.
After that, when the autopsy results came out, the victim was sexually assaulted after death. This made Han Bin feel that something was wrong.
The victim had clearly been electrocuted. If the murderer really had bad intentions, he could have done it to the victim at that time. There was no need to kill the victim first.
The third point of doubt was that the murderer threw the phone into the truck that transported the sand, diverting the police's attention. This meant that the murderer had a certain awareness of anti-investigation. It was reasonable to say that it was unlikely that he would leave any genetic material behind.
Huang Qianqian checked Liu Yongshan's ticket purchase records and found that he had bought a ticket to Quincy. His intention to escape was already very obvious.
With Liu Yongshan's ticket purchase information, it was not difficult to arrest him. In the car, Han Bin had already thought of a way to arrest him.
In fact, Han Bin had a bolder guess. Could Liu Yongshan be the real murderer? Although this possibility was not high, it could not be completely ruled out. Arresting someone also required full confidence. In order to be safe, Han Bin chose to arrest him at the security checkpoint.
The process of the arrest was very smooth. After the security officer gave Liu Yongshan a security check, Han Bin and the others swarmed up and surrounded Liu Yongshan.
After seeing Han Bin and the others, Liu Yongshan was so scared that he could not even speak properly.
Looking at him, Han Bin knew that he must have something to do. He immediately asked someone to handcuff him. When they were escorting him to the car, Liu Yongshan's legs were weak and it was a little difficult for him to walk. Bao Xing and Jiang Yang helped him into the car.
After returning to the Municipal Bureau, the people from the technical department collected Liu Yongshan's DNA.
Then, Han Bin struck while the iron was hot and took him to the interrogation room.
The people in charge of the interrogation were Han Bin, Jiang Yang, and Bao Xing.
Liu Yongshan entered the interrogation room and lowered his head. His expression could not be seen clearly.
"Bang bang." Han Bin knocked on the table. "Raise your head."
After being escorted all the way, Liu Yongshan seemed to have regained some of his courage. He forced a smile and said, "Officer Han, why did you bring me to the police station? I bought a ticket to another city. Aren't you delaying my business?"
"Now that you know I'm delaying you, why didn't you say that you were going to the airport?" Han Bin asked.
"I didn't think too much at that time." Liu Yongshan lowered his head.
"It's not that you didn't think too much. You were just scared," Han Bin said coldly.
"Yes, it's my first time taking a plane. It's inevitable that I'm a little scared."
"Alright, you're still pretending." Han Bin walked to the front of the desk and stared at him sharply. "Liu Yongshan, we arrested you because we have enough evidence. Even if you refuse to confess, we can still convict you."
Liu Yongshan took a deep breath. "I … I don't know what you're talking about."
Han Bin could tell at the airport that Liu Yongshan was not very brave. He probed, "Liu Yongshan, stop pretending. You're the murderer who killed Li Yuan."
"I didn't," Liu Yongshan shouted.
"That night, you went to the swimming pool and found Li Yuan swimming alone. You saw that she was beautiful and wore very little, so you had evil intentions. You knocked her out with an electric baton and then sexually assaulted her. In order to prevent her from calling the police, you even killed her."
"You're framing me. I didn't do that at all. I didn't use an electric baton and I didn't kill Li Yuan. When I got there, Li Yuan was already dead." Liu Yongshan argued loudly, afraid that Han Bin would push all the blame on him.
"You can't do this. You're wrong. I didn't kill anyone."
"If you didn't kill anyone, why did you run?" Han Bin asked.
Liu Yongshan looked conflicted. Finally, he sighed and said, "Last night, I saw the swimming pool lights on, so I went in and saw the girl lying by the swimming pool. I checked. She was no longer breathing, but her body temperature was still warm. I tried to save her."
"At that time, I pressed on her chest. She was wearing a bikini and looked very beautiful … I thought that since she was already dead, no one would know. As long as I could control myself, no one would know."
"In the end, I was too excited and couldn't control myself. I knew that I had made a big mistake. I was afraid that the police would catch me based on the DNA, so I pushed her into the water. I thought that maybe this could destroy the evidence and the police wouldn't be able to find out …"
Bao Xing looked serious and asked, "What do you do for a living?"
Liu Yongshan said timidly, "Security. I'm a security guard at the stadium."
"Pfft!" Bao Xing spat. "You really have the nerve to say that? Do you know what security guard means? You're tarnishing the reputation of your peers. Look at what you've done. It's worse than killing someone. "
"I was possessed. If that girl was still alive, I wouldn't have done that. I just couldn't control myself … I know I'm wrong. I'll change in the future!"
Bao Xing snorted and said disdainfully, "Don't worry. When you go to prison, you'll have time to reflect."
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