Through the investigation of the social relationship between Li Tianhua and Liu Yiping, the police did not find a suspect with a motive for the crime, let alone a suspect who had a grudge with these two people and retaliated for the murder. It is understood that there is almost no overlap in the life circles of the two victims, and there is no common feature between the two victims, except that they are both faculty members of the R City Pedagogical University.

Liu Yiping retired in 2004 and was rehired to work at the university for more than three years, while Li Tianhua was transferred to the Normal University in the fall of 2011 as a leader. It can be said that Li Tianhua didn't know Teacher Liu at all, and Teacher Liu only heard that there was a vice principal surnamed Li in the school, who was an alumnus of the university with his daughter, but he had no contact in private.

Both cases exhibit typical features of revenge killings. Although many people in the school rumored that the two cases were "indiscriminate killings" carried out by a psychopath who hated educators in order to take revenge on society, the police were more inclined to the possibility of acquaintances committing crimes.

(The so-called "indiscriminate killing" refers to the killing method of randomly selecting the target without any grudge between the suspect and the victim, which first appeared in Akihabara, Japan in 2008.) ）

Because the two victims are very different from each other in terms of gender, age, life background and other factors, the school will treat these two cases differently from ordinary serial murder cases. Because the average psychopathic serial killer often follows a certain principle when choosing a victim.

In the face of heavy pressure, the reason why the police are still insisting on the speculation that acquaintances committed crimes is because investigating from this aspect can give them some grasp, unlike looking for a psychologically abnormal person in the vast sea of people.

Another important basis is that in the first case, there were signs that Lai Tianhua's office had been roughly turned, and the police believed that the murderer was just deliberately trying to disguise himself as the crime scene of the theft, or to find something at the crime scene (but this speculation has not been confirmed by the victim's family and colleagues). In the case of a perverted homicide, the act of turning over the crime scene is unnecessary. Whether it's deliberately disguised or looking for something, it shows that there is a certain relationship between the murderer and the victim.

Considering that the pedagogical university was the only existing link between the two victims, the police focused their investigation on the faculty and staff of the pedagogical university as well as their families. However, after checking several people, they did not find any suspicious problems, and the road was temporarily blocked.

In addition, for the information provided by relevant witnesses: the day before he was killed, Mr. Liu had come into contact with a young man who looked like a college student near the family area. Based on the physical characteristics provided by witnesses, the police are stepping up the investigation of the male students at the Normal University. Due to the large number of students, this work will take a long time to progress.

At ten o'clock in the morning, Gu Song sat in his office and carefully looked through the files of the two cases. Although it is an unquestionable choice to combine the two cases based on similar characteristics, and he believes that the murderer who committed the two crimes is the same person, there are some subtle differences when you think about it.

The colleagues around him did not have any special opinions on the murderer's move to turn over Li Tianhua's office, but he was always haunted by this incident.

The so-called camouflage scene is unlikely in Gu Song's opinion, because no one would be stupid enough to run to the vice principal's office in broad daylight to rob and kill people, and such a camouflage is not necessary at all. The murderer was a well-planned and thoughtful person, who would not mislead the police in such a childish way, and did not even take away valuables such as mobile phones and wallets placed on the surface. Therefore, the murderer should have rummaged through Li Tianhua's office to find something.

As for what he was looking for, Gu Song was not sure, but judging from some special circumstances in the sequence of the case, he speculated that what the murderer was looking for should be the 600,000 yuan that Qi Ye wanted to borrow from Li Tianhua.

What is certain is that the person who turned over the scene of the crime would definitely not be Qi Ye, because Qi Ye did not wear gloves that day, so he left his fingerprints on the doorknob and door frame of the office, which was suspected by the police, but the investigators did not find Qi Ye's fingerprints on Li Tianhua's desk and cabinet.

If it weren't for Qiye, who else would know about that money? If the police have been investigating for so many days and have not been able to find a reasonable motive for the crime, is the 600,000 yuan the key to the problem? But in this case, how should Mr. Liu's case be explained?

According to Li Tianhua's wife, before the incident, she did not know that anyone was in charge of Li Tianhua's borrowing of money. The husband and wife have a harmonious relationship, there are almost no secrets, and the family's property is also open and transparent to each other. If there was suddenly a drop of 600,000 in the account, it was impossible for her not to notice it.

The preliminary restoration of what happened should probably be like this: On the evening of May 21, Qi Ye called Li Tianhua to borrow money, and Li Tianhua asked him to meet at noon on May 22 in the vice president's office, wanting to talk about borrowing money in person. However, someone arrived at the office before Qi Ye, killed Li Tianhua with a murder weapon prepared in advance, and then turned over the scene to find the 600,000 yuan, but returned empty-handed. When Qiye opened the door and walked into the office, Li Tianhua had already been killed, and the scene of the crime was bloody and terrifying, and Qiye was so frightened that he fled, so he became the first suspect in this case.

Thinking of this, a person's name suddenly appeared in Gu Song's mind: Long Simiao. This person is Qi Ye is best friend, he grew up with Qi Ye since he was a child, his father Long Yuejiang suffers from uremia and urgently needs a large amount of medical expenses, Qi Ye Guan Li Tianhua borrowed money to help Long Simiao's father.

If someone covets Li Tianhua's 600,000, Long Simiao is undoubtedly in the first place. The problem is that the reason for premeditating murder for the sake of a friend's imminent loan is ridiculous (unless he's trying to avoid paying his debts in this way). Moreover, Long Simiao has nothing to do with Liu Yiping, the victim of the second case, and has no motive for killing at all. It also seems absurd to suspect that he committed the crime.

The more Gu Song thought about it, the more headache he felt, and the idea that he had a little clear just now was now a mess again. He leaned on the table dejectedly, looking gloomily at the gray sky outside the window, and couldn't help but think of Zhong Xin and Xia Shi who were far away in Liangshan.

I don't know what the weather is like over there, has the rain stopped? Can I go into the mountains? Thinking that Tian Rui was still in Shen Hang's hands, Gu Song was worried, and he couldn't wait to kill Liangshan immediately and see with his own eyes what kind of place the set of coordinates left by Qin Yu was.

He was embarrassed to always call Zhong Xin and ask about the situation over there, as if he didn't trust them. He didn't have the face to take the initiative to contact Xia Shi, because Shen Hang had escaped, and he thought that he had an unshirkable responsibility. Although he knew that the other party didn't blame him, self-esteem was sometimes really harmful.

As his thoughts wandered, someone slapped him on the back. He came back to his senses, turned his head, and saw Fan Cong staring at the file in front of him expectantly, "How is it, Detective Gu, have you found anything?" ”

Gu Song spread his hands helplessly, "I don't understand what this murderer is thinking." However......" he sat up straight, his expression suddenly becoming serious, "I think Qi Ye and Long Simiao are still worthy of our further investigation." ”

"How?" Fan Cong asked with some puzzlement, "Hasn't Qi Ye been ruled out of criminal suspicion?" Judging from the current situation, it should not be that he killed people. ”

"Just because there are no killings doesn't mean there aren't problems." Gu Song reminded Fan Congdao, "Don't forget, that guy still has something to hide from us." In addition, I also want to know how Li Tianhua's sister Li Tianyu died. ”

"According to the data, Li Tianhua's sister committed suicide by throwing herself into the river in 1991 and had just turned 20 when she died."

"What about the cause of suicide?"

"I don't know." Fan Cong frowned and asked thoughtfully, "Does this have anything to do with the case we want to investigate now?" ”

"Maybe not, but understanding the victim's life experience is essential. I have a feeling that there is a deep secret to these recent cases. Gu Song paused, "Eh, I suddenly remembered one more thing." ”

"What's the matter?"

Qiye's father was sentenced to death in 1995 for intentional homicide, and his motive for killing is said to remain a mystery to this day. Qi Ye and Li Tianhua both came out of the same village, I am a little curious, what is the relationship between their two families? ”

"If you feel the need to know, then I'll take the time to try to investigate. However, the place in their hometown is still very closed, and I am afraid that these old things will have to go to the local area to figure it out. ”

"Not necessarily. Long Simiao's father is now in R City for treatment, and he should know a little bit about what happened in their village at that time. Let's ......" Before Gu Song finished speaking, the mobile phone on the table suddenly rang.

He picked up the phone and said "Hey", and the other party immediately said, "Hello, Officer Gu, I'm Xiao Xing from the police station." You came to me that day to inquire about Yu Jianan's situation......"

"Do you have any news?" Gu Song hurriedly asked.

"Yes, we've found him."

"That stinky boy ran back on his own? Where is he now? Does his sister already know the news? ”

"Well, that's the case...... the other party was silent on the other side of the phone for a few seconds, and replied in a low tone, "Although we found him, but ...... He's, he's dead......"