The crime scene was a self-built house. The room was not large, only about 40 square meters.
There are about ten self-built buildings at No. 127 Songjiang Road. They have not been demolished and many tenants live here.
When the police were received, the victim’s information had been basically confirmed and the deceased was a tenant here.
"Team Qin, the person who rented the house is named Zhang Xiaotian. He is a young man among the four victims. The other three, the young woman is Zhang Xiaotian's sister, and the other two are Zhang Xiaotian's parents."
The landlord is now accepting inquiries from Zhang Hui outside.
"When did Zhang Xiaotian rent a house here?"
"March last year."
The landlord was a middle-aged man. He found the victim dead and it was the landlord who called the police.
“I rented my house to him for 800 yuan per month, and the agreement was to deposit one and pay three. He has not paid me the rent this quarter. I came over today to take a look, and I didn’t expect the result. When I opened the door, I found that several people were dead. "
The landlord's face was pale now, and his speech was a little unreal. He was obviously frightened.
"Does Zhang Xiaotian usually live here alone or does his family live here?"
"Alone, but not at the beginning. Last year, he lived here with another man for a while. , and then the man seemed to have moved away. After the Chinese New Year this year, Zhang Xiaotian has been living here alone."
"Do his parents come here often?"
" Come over once or twice, usually on weekends. His parents are also working in Haizhou City. Their whole family is working here, but I don’t know the specific situation. I heard him talk about it when chatting with his father. "
"Do you have any information about the man who lived with Zhang Xiaotian last year?"
"Yes, yes. When they lived there, according to the current requirements for renting a house, they had to register their ID cards. I have copies of their ID cards."
"It's upstairs. I'll give it to you now. Take it away.”
Outside, other members of the criminal police team were also questioning other tenants in the building.
"I didn't hear anything last night. I was too tired from work and slept very hard when I came back."
"His parents came yesterday afternoon. I have seen them before. Usually they stay here for one night, but they didn’t seem to hear anything last night.”
"Our monitoring system is not good, they are all broken, and the landlord does not pay to repair them. We have told him many times."
"Zhang Xiaotian seems to be a repairman in a car 4S shop. Specifically, we are not. I know very well that most of the time he comes back late and doesn’t like to communicate with us.”
“I think it was the man I was with last year who did it. You don’t know that they are gay. . ”
“When the man moved out last year, he almost got into a fight with Zhang Xiaotian and the things inside were banging. I heard it from the next door.”
Visit and investigate. Most of the information is of little use.
In real life, everyone lives their own life, and few people have the leisure to worry about other people's affairs, so most people cannot provide any valuable clues.
But Zhang Xiaotian’s neighbors still know a little more information.
According to the information provided by the other party, Zhang Xiaotian is likely to be gay, and the man who lived here with him last year is his partner.
A few minutes later, Zhang Hui got a copy of the ID card of the man who lived with Zhang Xiaotian last year.
Wang Junshan. "Check where this person is now."
While the investigation was going on outside, Lu Chuan's on-site survey was also continuing.
Because the floor of the entire room was basically covered with a layer of blood, Lu Chuan and Lao Yang first laid some survey treads when they came in, so as to minimize damage to the site.
Under normal circumstances, blood can coagulate within 3 to 15 minutes after it leaves the body.
If the amount of bleeding is relatively large and the blood accumulates, the coagulation time after injection will be slightly longer, but it will not exceed 30 minutes.
Blood coagulation is a coagulation function inherent in the blood itself.
Under normal circumstances, when the body suffers accidental injury and causes bleeding, the blood will coagulate within a short period of time.
Because there is a substance called thrombin in the blood, thrombin is in an inactive state under normal circumstances.
But when the blood flow speed increases and the permeability of blood vessels increases, this thrombin substance will be activated to form thrombin and then produce fibrin.
This kind of fibrin will form a layer of mesh-like material outside the damaged blood vessels. This mesh is relatively small and platelets cannot pass through it. When platelets fill the mesh, blood clots will form and block the blood vessels. The blood continues to flow.
Normally everyone has this coagulation function, but a small number of people are born with coagulation dysfunction. After the body is injured and blood flows out, the blood coagulates very slowly, which requires special methods to stop bleeding.
However, the human body’s autocoagulation function has a certain range.
The blood vessels of the human body are divided into arteries and veins. Many of the arterial blood vessels are deep in the skin surface, while most of the blood vessels on the skin surface that can be observed by the naked eye are actually veins.
The coagulation function can function mostly after the veins are damaged. Generally, if the arteries are damaged, the coagulation function cannot successfully prevent the blood from flowing out.
After four people died at the scene, blood coagulation was different from normal coagulation. After a large amount of blood was ejected, the thrombin in the blood itself was not fully activated.
Instead, they are activated one after another during the injection process, so some blood coagulates quickly and some blood coagulates slowly.
Of course, the blood at the scene that Lu Chuan and others saw now had basically coagulated, and it should have been about 5 to 6 hours since the victim died.
Of the four people on the bed, two of them had their carotid arteries cut off with a sharp instrument, causing massive bleeding and leading to death.
The other two were stabbed in other parts, resulting in death.
The deceased whose carotid arteries were severed with a sharp weapon were two men, one middle-aged and one young.
Two women were on the ground. The young woman was stabbed to death in the abdomen, and the middle-aged woman was stabbed to death in the chest.
"There are signs of struggle."
Yang Sen pointed to the two dead women on the ground.
The two men were fatal with one blow, and there was basically no sign of resistance. However, the two women had scratches and bloodstains on their bodies and hands, and the signs of struggle were obvious.
Lu Chuan nodded: "There are traces of scrubbing on the bloodstains beside the bed. The murderer was most likely injured during the struggle, and there may have been bloodstains left behind."
Liu Guodong walked to the spot where the bloodstains were being scrubbed, holding on to a step on the site, and observed by himself: "The other party seemed to have just washed it with water?"
"No detergent?"
" There shouldn't be. I'll wipe some and do some identification later. If the murderer really bled, we can compare the DNA information." (End of Chapter)