So far, from seven to ten thirty o'clock on the night of the crime, everything that happened in these three and a half hours has been clarified.

Judging from the information obtained from the investigation, Cai Wenhong and his driver were the last people to see Shen Guanghe's family.

But Cai Wenhong said that when they left, Shen Guanghe was still alive.

That means that Lei Yuyang, Cai Wenhong, and Xin Shuhui, at least one of them lied.

Judging from the motive for the killing, Cai Wenhong is the most suspicious. Cai Wenhong is a rich second generation, and he is also a boss, and his family background and social identity make him a master who says everything.

In the face of Shen Guanghe's verbal ridicule, it is very likely that he will commit a murder of passion.

Not to mention Cai Wenhong's driver, even if he did not participate in the killing, as a witness, he is also guilty of harboring, and it is very likely to rise to a gang crime.

If Cai Wenhong really killed someone, then the two of them are grasshoppers on a rope.

Li Meng and I returned to the Ningzhou Municipal Public Security Bureau with the collected biological information, and immediately sent the biological samples to the trace examination department.

After more than 12 hours of hard work, the biological samples collected in this case have basically completed the trace detection.

Jiang Tingbai stayed up all night, his hair was a little oily, and his face didn't have the hearty smile of Lotte before, and some of them were just so sleepy that they couldn't open their eyes.

"A total of eight people, including a three-year-old child, were found at the scene." Jiang Tingbai yawned loudly, and as a result, the investigation box in Li Meng's hand took out the biological sample.

Then, he handed four blood samples to the police officer next to him: "Send this to the laboratory to determine the DNA profile." ”

After speaking, Jiang Tingbai scanned four fingerprint samples with professional instruments, entered them into the computer, and compared them with the biological information collected at the scene.

Watching him yawn, I also hit one, and Li Meng followed up with one.

After about five minutes, all the biological information was compared, and the similarity reached more than 90 percent, which can be used as evidence to determine the identity.

These eight people are Shen Guanghe's family of three, nanny Xin Shuhui, Lei Yuyang and assistant, Cai Wenhong and driver.

"Then it excludes the possibility of other people breaking into the house to commit the crime, and the murderer is among these eight people." Li Meng said in a deep voice.

"Other than that, did you find any clues?" I asked.

Jiang Tingbai looked at me a little sneeringly and shook his head slowly.

This case happened too suddenly, and in the face of a large amount of information and a large number of people involved in this case, we were a little caught off guard.

"By the way, I found a suspicious point, the biological information of these four guests was found on the first floor, but not on the second floor." Jiang Tingbai looked at us for a while, and then said suddenly.

"In other words, none of these four guests have been to the second floor?" Li Meng suddenly asked.

Jiang Tingbai nodded, then looked at us, and said helplessly: "What does this mean?" The killer could have put a plastic bag on his feet and go up to the second floor to kill people so that no fingerprints and footprints would be left behind. ”

Jiang Tingbai said very reasonably, in a relatively clean environment like indoors, it is difficult to leave footprints.

Even if the killer did not put a plastic bag on his feet, as long as the slippers were clean enough and free of dust, they would not leave obvious footprints.

"Actually, we still lack one of the most critical things." I pondered for a moment and said lightly.

"What's that?" Jiang Tingbai asked me.

"Motive for killing." I said seriously.

"This is a murder case, the motive for the murder is very important, and the possibility of vendetta is greater than that of passion killing." Li Meng took over and echoed.

"But who of these five men has a grudge against the family of the deceased? And it's a long-term hatred, a hatred that is enough to let go of the murder case? Jiang listened to Bai Youyou and said.

"Now that it has been more than twelve hours since the incident, we still have to continue to investigate the clues, especially the alibi of the nanny Xin Shuhui." Li Meng said seriously.

After leaving the Trace Examination Section, we returned to the office of the Serious Crime Team, and Lin Zifan and Xue Hang also came back from the investigation.

"Qin team, there are three entrances and exits in the high-tech community, two gates, which can be opened to traffic, and a small gate, which can only walk pedestrians and non-motorized vehicles." When Xue Hang saw me enter the door, he immediately reported to me what he had investigated.

"Did you find anything?" I nodded and asked casually.

"There is no surveillance at either gate, but there are traffic light monitoring probes on the road outside the gate. I have already brought back the surveillance video, and after comparison, the Technical Investigation Department found the figure of Lei Yuyang, the owner of Dream Fashion Jewelry. He left in a taxi, and surveillance footage captured his face clearly. ”

After Xue Hang finished speaking, he added: "The monitoring probe can only shoot the road, not the sidewalks on both sides, and Xin Shuhui was not found." She should have left through a small door, outside which was a vegetable market with no surveillance. ”

After he finished speaking, I told Xue Hang the vehicle information of Cai Wenhong, the owner of Kaka Studio, that I had just obtained, and asked him to continue to determine the exact time of their departure according to the surveillance video comparison.

Subsequently, Lin Zifan also reported his findings to me: "I conducted an investigation based on the identity information of the deceased, and I found the medical records of the female deceased Fang Hemei, who registered with the psychiatric department of the hospital, and the cause was that she suffered from postpartum depression, and the time of medical treatment was two years ago. ”

Postpartum depression is mainly a psychiatric syndrome, and the main symptoms are gloomy expression, listlessness, drowsiness, easy tearing, crying, etc. The etiology is related to endocrine, postpartum nervous anxiety, physical diseases, leading to endocrine disorders, inducing a kind of depression.

Typical postpartum depression occurs within 6 weeks after giving birth, and can recover spontaneously in 3~6 months, but severe depression can last for 1-2 years.

"In this family, the man has obsessive-compulsive anxiety disorder, and the woman has postpartum depression." I muttered.

"The time of medical treatment was two years ago, and there has been no medical record of her since then, so she should have recovered." Lin Zifan said in a deep voice.

"The relatives of the deceased have been contacted, and they will be there in the afternoon." Lin Zifan added.

I nodded, and said listlessly, "You can handle the reception of the relatives of the deceased." ”

"Does Fang Hemei have any close friends? Friends who can learn about their recent situation, I need to know about the postpartum depression of Fang Hemei through them. Li Meng froze and suddenly said.