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"Yes, sperm spots were found in the deceased's **, and DNA samples were extracted after wiping, which can be used to compare with the suspect."

"The same strangulation tools, and the body was transported back to the vicinity of the community by the murderer, I think it should be combined." Wu said wrongly.

Everyone nodded, and Xiaobai looked at the photo of the deceased and said, "I have a question - either I say anything nonsense to the deceased, or ...... Judging from her appearance, Yu Sina is clearly younger and more beautiful, why is the murderer ...... Chose Yang Xiu? ”

"If you had it, you would have chosen Sina, right?" Wu asked wrongly.

This question made Xiaobai even more nervous, and he sneaked a glance at Xu Xing'er—after all, his forensic girlfriend was in the same department as Xu Xing'er.

Wu Cuo continued: "We can't speculate on the psychology of a rapist with the thinking of a normal person, as well as ...... Physiological needs. ”

"Indeed," Yan Ruyu agreed, "past data show that more than half of rape and molesters have physical or psychological problems. Lao Wu continued to talk about the on-site investigation? ”

"Okay, first of all, Yu Sina. Her murder seemed to be for money, but there were suspicions, the murderer took her cash and lighter - even the lighter was taken, at first I thought the murderer still had some vision, but the diamond watch worth more than 50,000 yuan on Yu Sina's wrist was still there, could it be that the murderer didn't find out? This is doubtful for the time being. ”

"Could it be that the murderer's purpose was not to make money at all? He doesn't have much vision," Minghui said: "Maybe take the lighter, just want to ...... Smoking a cigarette? ”

"There is indeed such a possibility, because the belongings of the deceased Yang Xiu were not lost. Yang Xiu's gold necklace, diamond ring and other jewelry are there, and the cash is also in the wallet intact.

The murderer seemed to be purely for sexual assault on Yang Xiu.

Yang Xiu's clothes were stained with a lot of grass residue, and Yu Sina's clothes were not ...... By the way, this detail cannot be ignored, Yang Xiu went out after eating at noon, and of course she would not have grass residue on her clothes, which shows that she got off the car halfway, not only got off the car, but also ...... on the grass was sexually assaulted by the murderer, perhaps because the murderer was tall and ...... in the car You can't do it.

I deduced that the murderer was tall because Yang Xiu's sunscreen jacket had a long hem and half a footprint on the hem, which should have been left by the murderer when he sexually assaulted him, and from the analysis of the footprints, the murderer was wearing a size 43 scorpion and was a tall man. ”

Yan Ruyu asked while looking at the autopsy photos, "Is there any difference between Yu Sina and Yang Xiu's death status?" ”

"The difference is gone, but there is one thing that I don't understand, the police in the jurisdiction investigated the interpersonal relationship between the two and found that there was no intersection, except that the two lived in the same community, they had no relationship, could it be that the murderer killed people indiscriminately? Antisocial personality? ”

"Not a murderer." Yan Ruyu said.

"What?!"

This time, everyone's eyes were focused on Yan Ruyu's face.

Yan Ruyu put the photos of the two deceased's neck strangulation marks in the middle of the table, "The staggered positions of the ropes are all on the left side, indicating that when the two were killed, the murderer was indeed in the co-pilot's seat, but there is one detail...... Look carefully, on Yu Sina's neck, the staggered position of the rope is that the left side presses the right side, indicating that the murderer's right hand is on top and he is used to the right hand when strangling the neck, while Yang Xiu's situation is just the opposite, the person who killed Yang Xiu is used to use his left hand.

The murderer is not the same person, so it can explain why Yu Sina's property was stolen and Yang Xiu's was not, why Yang Xiu was sexually assaulted, but Yu Sina did not.

Also, grass residue, this detail cannot be ignored. ”

"Two murderers...... This is too ......," Wu said incredible.

"But there must be some kind of connection between the two murderers, cooperation or ...... Competition ......" Yan Ruyu patted his head, as if to open his memory, "In 14 years, there were two serial murder cases, which occurred in two cities far apart, I occasionally flipped through the big cases and unsolved cases across the country, and accidentally found that the victims of these two cases had similar professional backgrounds and extremely similar victim scenes, Lao Wu should still remember, right?" After assisting them in solving the case, it was discovered that the murderers on both sides had been in contact through a game forum, and it was a killing match. ”

"What do you mean...... The current case is similar to the old one? ”

"It's not unusual."

"Okay," Wu Cuo stopped writing and concluded, "What we know now:

First, there were two murderers who killed Yu Sina and Yang Xiu in a similar way, and there may be some kind of connection between the two murderers, of course, I am ...... for this inference for the time being Doubt. ”

When these two words were spoken, Wu glanced at Yan Ruyu, who raised his eyebrows, meaning "It doesn't matter, I'm too lazy to bother with you as a mortal."

Wu Cuo breathed a sigh of relief and continued: "Second, the murderer who killed Yang Xiu wore shoes that were size four or three, so it is inferred that he was tall, and we have obtained the DNA sample of the murderer;

Third, the killer of Yu Sina was relatively young, according to eyewitnesses, he was around 175 to 180 in size.

Fourth, the murderer is well-planned, familiar with road conditions, and able to skillfully evade road surveillance.

Regarding the direction of the next investigation, my suggestion is to investigate the surveillance in and around the Lily Manor community half a month before the crime, since the murderer chose to attack the two owners in the Lily Manor, he is likely to come to the vicinity in advance to look for targets. ”

"Leave the monitoring to me!" There are many ways of gold.

"There are a lot of them, I'll help you." Minghui said positively.

Yan Ruyu pressed his hand on the two people who had already begun to look through the surveillance, meaning not to worry, and then said to Wu Cuo: "There are still a few questions. For example, we know that the murderer got into Yu Sina's car at the cost of pretending, so how did the other murderer – I still think the murderers were at least two people – get into Yang Xiu's car?

In broad daylight, how could the murderer choose to sexually assault Yang Xiu on a piece of grass? That's really ...... It's unreasonable, but if it's not grass, then how did the grass residue on Yang Xiu's clothes get on it?

One more point, how was Yang Xiu's body discovered? What is the situation of the informant? You haven't said that. ”

Yan Ruyu handed the conversation to Wu Cuo.

This time Wu Cuo did not answer, the director of the public security bureau said: "Things are a bit complicated, yes, on the morning of September 1, 120 received a call from the masses, saying that someone fainted in the car, and after 120 arrived, he found that the victim Yang Xiu had died - it took some time to open the car door in the middle, I won't go into detail - after that, 120 emergency personnel called 110 to call the police, and soon after our police arrived, the case was taken over by the serious crime team."

We have found the phone number of the informant, but the informant said that he has been out of town for the past two days and it is inconvenient for him to answer the phone, and he will only come back tomorrow, and he will cooperate with us in accepting inquiries at that time. ”