Chapter 574

"The killer has surrendered!"

"The victim's ex-boyfriend, named Han Shengyan, claims he had a conflict with the victim due to emotional issues. The time was around noon today..."

"This Han Shengyan has some mental health issues; his parents came with diagnostic reports and the like."

Chai Tong relayed the news he received, sighed, and put away his phone.

For a mentally ill person committing murder, you can find logic in the investigation stage, but politically, it is difficult to link it to logical problems.

It meant that this wave of receding tide would eventually see Chai Tong receding along with it.

"Professor Chen, thank you for your hard work." Chai Tong took two steps forward, preparing to take Professor Chen back with him.

The killer had surrendered; although a series of case-handling procedures were still needed, for Chai Tong, this case ended here.

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Even if a forensic report was still needed, that would be Jiang Yuan or Wu Jun's job; an outside expert like Professor Chen was not qualified to sign it anyway.

Professor Chen stood up, also feeling a bit regretful, and said to Jiang Yuan: "I originally wanted to do some frontline work, but I didn't encounter a good opportunity."

Whether working as a forensic doctor or an anatomy professor, wanting to do frontline work requires dead people to cooperate. It was normal that Professor Chen couldn't find any. In fact, in a place like Ningtai County, it was perfectly normal for a homicide to occur and then be automatically closed without needing investigation.

This time's killer was a typical urban killer, with some mental issues, who fled after a crime of passion, and then returned to surrender under the persuasion of his family...

Although there were no statistics, similar killers were truly as common as could be.

Huang Qiangmin also came over and said to Jiang Yuan: "The scene investigation is about done; let's transport the body back."

The scene could only allow for some surface examinations; the specific autopsy report would eventually have to be done back at the station.

The surrounding police officers also stood up, somewhat relaxed.

Jiang Yuan coughed twice and said: "Wait a moment."

"Huh?" Huang Qiangmin turned around, puzzled.

"Who is doing the killer's interrogation? It shouldn't have been done yet, right?" Jiang Yuan asked.

"It's being interrogated now." Seeing Jiang Yuan had questions, Huang Qiangmin called back directly.

The call connected, and Huang Qiangmin handed it to Jiang Yuan.

After a few greetings, Jiang Yuan asked: "When asking for details, please confirm the time the conflict broke out, as accurately as possible. Also, the number of attacks and whether there was a return."

If the first two sentences were normal, the "return" Jiang Yuan mentioned was quite intriguing.

Everyone present was a police officer, except for Professor Chen, but everyone basically caught the meaning.

Huang Qiangmin asked: "Is there a situation of secondary injury?"

Hearing this, Professor Chen came over, re-examined the body, and said: "The back of the head suffered multiple traumas, but it's impossible to confirm if it was two separate injuries."

His academic level in anatomy was super strong, and he was naturally a dab hand at forensic medicine, so he was very confident when speaking.

Jiang Yuan nodded: "From the trauma, it is indeed hard to distinguish. However, I think there is a problem with the timing of the bloodstains. Also, judging from the state of the body, the criminal act was not completed in one go."

"Bloodstains..." Professor Chen's experience was still lacking; he wanted to judge the generation time of the bloodstains just by looking at them—it wasn't that he couldn't do it, but he might need to check some data and do some calculations.

After all, this was a very serious homicide; to give an accurate conclusion, one must comprehensively consider the environment of the scene, including whether there was direct sunlight, the temperature inside the restaurant, etc.

Assuming the victim died at noon, it had been at most six or seven hours until now. If one were to rely on blood to judge if there was a secondary crime, the time difference might be one or two hours.

In such a short time, whether the restaurant had the air conditioning on, the intensity of the sunlight, and whether there was wind could all become key factors. Moreover, under different time dimensions, the situation in different regions during different seasons would definitely be different. From a scholar's perspective, it meant many sets of regression equations...

Professor Chen certainly couldn't memorize these things; he was an anatomist, and the gap between him and someone doing bloodstain analysis was like the difference between a crocodile and an alligator snapping turtle.

But as for checking now, Professor Chen actually felt it was quite unnecessary.

He asked directly: "How long do you think the time difference of the bloodstains is?"

"An hour and a half, at least." Jiang Yuan gave a precise figure, because for this homicide, this time difference appeared exceptionally important.

At the same time, Jiang Yuan was also quite confident.

Honestly, for a current case, the means Jiang Yuan currently possessed were truly too many.

A fresh body that died at noon, facing LV6 Death Time Estimation, LV4 Forensic Pathology, plus a set of full LV5 Bloodstain Analysis, Crime Scene Investigation, etc. —to be blunt, Jiang Yuan knew better than the victim himself how he died.

And Jiang Yuan's answer completely pulled back the emotions of the crowd that had just relaxed.

Everyone was familiar with Jiang Yuan, and their confidence in him could be said to be stronger than their confidence in their own wives.

Since Jiang Yuan mentioned the time difference problem, there were two explanations: one killer, or two killers.

One killer would be simple; just keep interrogating the criminal suspect who surrendered. But if there were two killers, how to find the second one was no laughing matter.

The investigation kits and other items that had just been prepared to be packed away now had their brightness adjusted again, and they continued to search for fingerprints and footprints.

Jiang Yuan changed into a new pair of gloves, observing the bloodstains while waiting for the interrogation results from the bureau.

For the criminal suspect who surrendered, interrogation shouldn't be a problem; at the very least, getting some basic information was fine.

Not long after, the phone call did indeed come through.

Huang Qiangmin handed it directly to Jiang Yuan.

"This Han Shengyan claims there was no return. Regarding the specific details of the violent conflict, Han Shengyan cannot say. The problem now is that he was stimulated by this incident, his mental illness has flared up, and his testimony may have flaws." The police officer on the phone spoke as concisely as possible, clearly knowing that there were changes at the scene.

"What about Han Shengyan's parents? When did they see Han Shengyan?" Jiang Yuan asked.

"Around 4 PM." The police officer at the bureau said.

Calculating the time, it was just enough for one return. But unless it was a premeditated double return, this time was already a bit tight.

Huang Qiangmin said at this time: "You can use the mobile phone to check the last time it connected to the base station."

This would require applying to the technical investigation unit.

Jiang Yuan nodded and took the opportunity to activate the Crime Scene Reconstruction (Temporary +1 and lasting 535 minutes) skill.

This skill was recently acquired; its reconstruction effect did not come solely from bloodstain analysis, but also from crime scene investigation, and even image enhancement skills.

For the scene before his eyes, it was at least equivalent to the level of LV6 Bloodstain Analysis.

"The victim first hit the wall."

Jiang Yuan re-examined the scene, walked up, called a technician over to take photos, and said: "This should be soaked bloodstains."

Professor Chen also walked over to look, nodding: "Indeed, but in a few hours, it's normal for soaked bloodstains to form."

"I bet there are also wiped bloodstains here." After Jiang Yuan spoke, he realized Professor Chen was a teacher and hurriedly said: "I mean, judging from the position of these soaked bloodstains, the victim should have been moved."

"You're betting quite boldly." Professor Chen didn't know what his state of mind was at this moment; a student who had only graduated for two years could grow to this extent, even making him confused about his own school's capabilities.

Jiang Yuan smiled, called two people over, and said: "Transport the body away."

Then, the four of them worked together to lift the body as lightly as possible.

As the body left, on the floor below, there indeed appeared some obvious wiped bloodstains.

Of course, wiped bloodstains also have many explanations; for example, if the deceased crawled with difficulty before dying, it is possible to form such bloodstains.

However, crawling would clearly leave other traces around, such as bloody handprints, or traces of force from knees or feet.

Without these, plus the fact that the body was lying face up, the wiped bloodstains were very likely caused by passive displacement.

Professor Chen nodded slowly and couldn't help but say: "You really bet right."

Jiang Yuan tacitly agreed; this move was indeed quite difficult.

Director Chai, who had been standing outside the circle watching, suddenly felt particularly uncomfortable. Jiang Yuan's strength was a bit too strong, wasn't it? And such a strong subordinate had actually slipped through his fingers?