Chapter 1043

Jiang Yuan took Sun Jianyu's documents in hand, examined them carefully again and again, and had someone make rubbings of his hand and footprints, then compared them with the strangulation marks on the victim's body.

Sun Jianyu was under 1.7 meters tall and weighed just over 80 jin, a skinny guy with a thin waist, thin legs, and thin arms. The victim, Sun Xuwen, weighed about the same as Sun Jianyu; although female, she had slightly less strength, but it would be relatively difficult for Sun Jianyu alone to strangle her to death.

It's no wonder there were strangulation marks on Sun Xuwen's neck—it should have been Sun Jianyu or Liu Mingxue who performed the assisting action. However, the victim's hyoid bone was not fractured, which also indicates insufficient force in the strangulation.

Of course, purely analyzing from the aspect of insufficient strength, Sun Jianyu's girlfriend, namely Sun Xuwen's close friend Liu Mingxue, had even less strength. But reasoning by common sense, as a woman, Liu Mingxue, in a situation of insufficient strength, actively adopting violent strangulation to deal with Sun Xuwen, the possibility is still relatively low.

"Based on current observations, the two should have conspired, with Sun Jianyu as the main perpetrator and Liu Mingxue as the accomplice, jointly killing Sun Xuwen." Jiang Yuan stood at the crime scene, flipped through his PAD for a while, and gave an answer that was not surprising.

One important task of the forensic examiner is, in a homicide involving multiple perpetrators, to determine who the actual killer is. A typical example is a group of young people fighting, someone dies as a result—at this point, the primary responsibility does not lie with the person who threw the most punches, but with the one who performed the lethal act.

Suppose the victim was struck on the back of the head with a wine bottle, her heart also stopped suddenly, and her thigh was also pierced…… then the forensic examiner must determine what the actual cause of death was—was it the wine bottle, so grab the person who smashed the bottle; was it the thigh, so grab the person who stabbed; or…… if it was cardiac arrest, then everyone can only go to prison together.

Jiang Yuan concluded that Sun Jianyu and Liu Mingxue were joint perpetrators; after sending the evidence for inspection, it would likely result in a verdict without distinguishing primary from secondary responsibility.

Meng Cheng, on the other end of the phone, heard this and immediately responded: "I agree, Sun Jianyu definitely participated. Liu Mingxue also can't escape. These two are minors, their minds are not mature, after interrogation yields results, I think there's no problem."

"Alright, then I'll leave it to you." Jiang Yuan confirmed the perpetrator, then carefully toured the secret base of several people, and afterward, took Sun Jianyu's motorcycle and returned together to Changyang City.

Although the tire tracks at the second scene cannot be used to confirm identity, they can be used to exclude. And in this case, transportation tools definitely need to be considered. Even if the specific motorcycle used cannot be confirmed, at least it must be proven that Sun Jianyu had access to obtain a similar type of motorcycle.

By the time they returned to the Changyang City Bureau, Wang Chuansheng and others had already prepared the case files almost completely.

This case itself indeed has difficulty, but the difficulty mainly lies in the environment—the heavy rain that night indeed washed away many things, including Sun Jianyu's footprints from climbing the wall, ultimately making them impossible to prove. Because fresh footprints were scattered by a rush of rainwater, whereas footprints with some age remained.

On the other hand, as minors who were the perpetrators, their behavioral patterns were also very puzzling. Including the motive for killing, and the method of concealing the killing, both were non-adult-like.

If it were an adult, not to mention whether they would kill over something like needing to clean and tidy a room, post-event handling would not involve fearing relatives discovering it, daring not to throw away a pillow, only able to desperately scrub it. When disposing of the body, they would not simply dump it hastily by the roadside, still leaving such deep motorcycle tire marks.

But to say the two had no brains—they not only knew how to dump the body, but also knew to strip the victim's clothes and pants off, staging it to look like sexual assault.

However, regarding these details, Jiang Yuan's level of attention had already become very low.

For Sun Jianyu and Liu Mingxue, their ability to resist interrogation was very weak; with the current evidence, it was sufficient to interrogate them until they repeatedly recounted the details dozens of times.

Yu Wenxu and others were even more satisfied; after receiving Jiang Yuan's report, they kept saying: "I never expected this case to be committed by two minors. Our Changyang City cases are still not twisted enough..."

"Already quite twisted." Shen Yaowei accompanied throughout, although he didn't play much of a role, but he understood the case very clearly, saying: "Two minors, just because of a small argument, then the best friend and boyfriend together, just did the person in. Afterwards they even dumped the body—if this case isn't solved, in another ten years, who knows how many victims will suffer misfortune."

Yu Wenxu nodded: "Not completely twisted."

"Thanks to Captain Jiang, our task force here has been unable to push the case forward." Cao Chujun sighed twice. He was an old team leader nearing retirement, and regarding face or such things, he had already come to view them lightly; when the time came to leave, he increasingly valued being able to solve a few major cases, to also comfort himself after forty years as a police officer.

Jiang Yuan smiled and declined twice. Although he himself assessed that the case's difficulty was not high, but in front of the former task force leader Cao Chujun, he felt uncomfortable saying that.

Cao Chujun, however, saw through it. Veteran criminal investigators all have a kind of insight—not necessarily able to solve cases, but able to see through people's hearts.

Cao Chujun felt a warm surge in his heart, seizing the moment before Yu Wenxu spoke, striking while the iron was hot: "Captain Jiang, twisted cases are actually very numerous, especially the old backlog cases—some cases are just too old, making investigation difficult..."

This is just like fishing with a straight hook.

Cao Chujun gazed passionately at Jiang Yuan.

Jiang Yuan smiled slightly, glanced at Yu Wenxu, then said: "Actually, I'm not particularly pursuing twisted cases; solving ordinary homicide cases brings a very prominent sense of achievement."

Yu Wenxu said at this moment: "You usually bring along thirty-plus people; for ordinary cases, the cost-effectiveness is too low, right?"

Jiang Yuan was stunned for a moment—he had indeed not considered that.

Cao Chujun hehehed twice, also looked at Yu Wenxu, his tone becoming somewhat more formal, saying: "Speaking of these twisted cases, the previous 303 Special Task Force, I think it qualifies."

"The 303 Special Task Force..." Yu Wenxu quickly pulled up his memory: "The victim was a 31-year-old woman Zhao Qian, and a 28-year-old man Qin Jijian, and a 35-year-old man Gu Daxu...... three people were engaging in a threesome at Zhao Qian's home when they were hacked to death inside?"

"Yes, that's the case—you still remember the victims' names, truly impressive..." Cao Chujun patted the most cliché flattery of the Changyang City Criminal Police Detachment, eliciting a burst of laughter from Yu Wenxu.

"The 303 Special Task Force is indeed a relatively twisted case—the perpetrator's skills were not bad, the actions were brutal, and for seven or eight years it remained undetected, so it should be taken out again for re-examination." Yu Wenxu said while looking at Jiang Yuan, adding: "I guarantee, the scale of this case is much greater than that of the previous case."

"Actually, there's no need to pursue the twisted nature or scale of cases." Jiang Yuan sighed.

"This case is quite formidable." Cao Chujun shifted the topic, saying: "The perpetrator of that case entered through the balcony's anti-theft window, which he pried open with his hands. After entering, he killed three people in succession, then cleaned up and left, with very neat movements and excellent skill. The scene also yielded no bloody footprints or the perpetrator's DNA."

"Were all three victims single?"

"All were married." Yu Wenxu knew what Jiang Yuan wanted to ask, then continued: "The partners of all three have been investigated, and they have alibis; moreover, the sexual partners of the three victims were not limited to two each, some possibly even more concealed, so the case has consistently failed to pinpoint a suspect."