The color of the corpse's skin is also one of the important indicators for judging the time of death of the corpse.
Generally speaking, a corpse will retain its original color for a short period of time after death.
But over time, the color of the body will slowly change.
Under non-frozen conditions, the color of a general corpse will change over time, going through blue-purple, light red, brown, sallow, light green, dark green or even black-green.
Without outside intervention, the giant will eventually appear, then corrupt, and then turn into a skeleton.
In the case of freezing, the color change of the corpse is different. The process of bruising will be slower, and when the temperature is low enough, subsequent putrefaction changes will not occur.
In addition, in some special cases, such as when the deceased died of gas poisoning, the color of the skin, especially the lips, will appear cherry red.
The corpse at the scene was completely frozen. In this case, it was impossible to judge the time of death of the corpse based on the degree of rigor mortis.
The temperature has also been consistent with the outdoor temperature, and the color of the skin has not changed much.
Wang Changjiang's estimate of death within a week is a relatively conservative estimate.
Because, after more than a week, the color of the corpse will change to a certain extent even in the frozen state.
However, there were not only corpses at the scene where the bodies were found, but also spots of blood.
Wang Changjiang continued to give further estimates of the time of death: "There are spots of blood on the snow, indicating that the murderer's body was not rigor mortis when he dumped it, otherwise there would not be blood dripping out after being scratched on the wall."
"Based on this situation analysis, the time of death of the deceased should not exceed 48 hours."
At this point, the cause of death was strangulation and mechanical asphyxia.
Time of death was within forty-eight hours.
The on-site inspection and photography, preliminary examination of the body, and blood stain collection have all been completed.
Liu Guodong packed up the current survey equipment and walked around the body: "Xiao Lu, I will walk through the outer spiral first, and you can walk through the inner spiral."
Lu Chuan nodded. The on-site investigation is not just about taking photos of the scene and collecting physical evidence.
Every on-site survey has certain prescribed procedures, and searching the site is the most important part.
Common survey and search methods include linear search, grid search, area search and circular radiation search.
Generally speaking, linear search is more commonly used in outdoor scenes, and criminal police are commonly known as belt-stroking.
In the last case of Song Kun's murder, Lu Chuan used this search method when the vehicle hit the scene and found traces of vehicle acceleration more than 100 meters away.
Grid searches target indoor scenes and are often used for smaller, complex crime scene searches.
Specifically, start from one end of the on-site wall and search in a straight line to the other end with a width of no more than 50 cm. After reaching the other end, turn around and search along the parallel line of the first search to the other end.
In this way, after searching a plane, such as the north-south plane, start the search in another direction, that is, the equal search mode of the east-west plane at the end point of the search and continue the search.
This method is the most systematic and thorough, as cautious and meticulous as a cat arching its back and preparing to catch mice.
The regional search method is for multiple people to continue searching a larger area.
For example, during the search in Jiguan Mountain, police dogs and hundreds of police officers were dispatched to conduct an area search.
Now, Liu Guodong is planning to use circular radiation search.
This method is mostly used at outdoor scenes, with the corpse as the center and the investigating detectives searching in circles.
There are two modes, one is the outer spiral, which starts from a distance and circles around to approach the corpse.
There is another type called internal spiral, which uses the corpse as the starting point and searches in circles outwards.
Lu Chuan and Liu Guodong worked together to better search the scene.
While the inside of the wall is busy, the survey outside the wall is also continuing.
However, looking at the faces of Yang Sen and Lao Bai, they knew that the gains were not very big.
"There is a path trodden by an old man doing morning exercise on this side of the wall. The murderer's shoe prints...can't be collected."
Lao Bai squatted outside the wall facing the corpse, carefully observing and analyzing it.
Yang Sen also discovered this. He thought that this construction site was inaccessible. The other party dumped the body here, and the ground was covered with snow. There would be clues such as footprints.
However, this side of the wall is adjacent to a small amusement park, and many residents doing morning exercises are walking nearby.
The snow under the wall had been trampled so tightly that there was no possibility of leaving any footprints.
Of course, there are not no traces at all. No matter how tightly the snow is trampled, as long as it is not frozen, there will still be footprints left when people step on it.
At 1:30 noon, the investigation and forensic work were completed.
The body had been loaded into the car, and except for the members of the action team who were investigating nearby, the others returned to the criminal investigation detachment one after another.
In the car, Shen Yan's cheeks were red and she kept rubbing her hands.
In Haizhou at the end of December, the temperature was already over ten degrees below zero.
Everyone had been outside for three or four hours and was already freezing.
Fortunately, the car kept starting and the air conditioning and heating effects were adequate.
"Has the identity of the deceased been confirmed?"
This time, Yang Sen was very considerate of Lu Chuan and took on the task of driving. In the back seat, Lu Chuan and Shen Yan sat side by side.
The professional car currently surveyed has a lot of equipment inside, and there are no separate seats. There are only two long chairs in the middle of the equipment wall.
It can seat four people in a squeeze.
The driver and co-pilot can seat two people in the front row, for a total of six people.
Liu Guodong and Wang Changjiang wanted to report the current investigation and preliminary autopsy to Qin Yong, so they took Qin Yong's new car.
Now there are only three people left in the survey car: Lao Bai, Lu Chuan and Shen Yan.
Lao Bai was now sitting in the passenger seat, and only Lu Chuan and Shen Yan were left in the car behind.
"Probably not yet."
Lu Chuan shook his head: "I just heard from Zhang Hui that the investigation of nearby residents is not very good. No one knows the deceased."
"I have to go back and compare the fingerprints to see if I can find anything."
The first step in investigating a murder case is to confirm the identity of the deceased.
Without this premise, nothing else can be discussed.
Fortunately, the corpse had been dead for a short time and was frozen outdoors. It was much easier to collect fingerprints than the last time Lu Chuan collected fingerprints from the corpses sunk in the reservoir.
After returning to the criminal investigation detachment, Qin Yong immediately held a case analysis meeting.
Lu Chuan also started comparing the fingerprints of the deceased.
As for the autopsy, it is not possible yet. The body is still frozen and hard. The autopsy can only be performed after the body softens.
The fingerprint comparison work continued smoothly, but the results were far from ideal.
"Master, there is no fingerprint information of the deceased in the fingerprint database."
Liu Guodong frowned. There was no fingerprint information stored, which meant that the deceased's fingerprints had not been collected before, at least in Haizhou City. In this case, the probability that he was not a local was higher.
In addition, there have been no reports of missing persons in the past two days, and the appearance comparison has yielded no results. The deceased is not in the missing persons library.
"What are your next ideas?"
Some people died, but not completely...
