Chapter 730: Killer Evolution Theory!

Yuan Keyu was murdered.

Dou Zhihai was murdered.

During the investigation, it could almost be confirmed that the same person committed both crimes.

But the cases done by the same person presented two completely different results, which naturally led to speculation.

Chen Xiao did not discuss anything with Cao Xiuyuan and the others at this time, but rather began to think on his own.

"If both Yuan Keyu and Dou Zhihai were caused by Ye Jun... no, it should be Ye Jun. Because on the night Dou Zhihai was killed, Ye Jun could not provide a complete and effective alibi."

"In the case where both were his doing, Dou Zhihai’s murder was different, after thinking it over, possibly there is only one possibility..."

"That is, he did not have enough time to perfect the subsequent matters, or some unforeseen circumstance arose when he was about to do these things!"

At this point, Chen Xiao immediately looked at the three, Qin Fei:

"Captain Cao just analyzed this, from Ye Jun’s demeanor, we can clearly feel the youthful mentality. Officer Dou’s death was, for him, a complete victory in toying with the police."

"Thus, for Professor Yuan’s murder, he took his trophy, there’s no reason he wouldn’t leave something for himself when Officer Dou was murdered. Unless, every conversation I had with him today was him disguising it!"

"But now, I can bet on this, I don’t believe Ye Jun truly has such a powerful ability of disguise! To deceive me on all fronts— expression, emotion, demeanor, words!"

"Therefore, I now suspect there are two possibilities when Ye Jun killed Officer Dou. One: He was very aware this time he couldn’t fabricate a complete alibi, so after killing Officer Dou, he had no time to take anything for his trophy."

"Two, there was an accident when he was about to take the trophy! The occurrence of that accident left him no time to do anything but hastily dispose of the body!"

As soon as Chen Xiao finished speaking, Cao Xiuyuan seemed to come to a realization, his eyes widened and shouted:

"That’s not right!"

Upon hearing these words, Qin Fei frowned and asked, "What isn’t right?"

"We overlooked the aspect of Xiaodou’s body being disposed of!" Cao Xiuyuan corrected.

Chen Xiao’s expression also changed slightly: "After Officer Dou was murdered, he was hung on the outer wall of a shopping mall in Zhushan City. In fact, this already declared his victory."

"Indeed, he didn’t need to take any trophy, because someone would commemorate his victory! For instance, the first people who discovered the scene might take pictures, and even the reporters who came upon hearing it would also bear witness to his actions."

Chen Xiao nodded at Cao Xiuyuan.

The latter was indeed correct.

If we only discuss the trophies, the public witnessing Dou Zhihai’s body disposal, far more satisfies the sense of achievement of his victory than taking something.

Thus, if we are to analyze the killer’s psychology based on the trophy, it’s no longer reasonable at this moment.

But just as Chen Xiao was about to think of a new direction, Cao Xiuyuan said with a smile:

"However, the accident that Chen Xiao mentioned in the process, I think it deserves more pondering."

Chen Xiao asked in some surprise, "Captain Cao, please speak directly."

Cao Xiuyuan nodded slightly: "I am not sure how much experience you all have with serial killers, but often the hardest to typify are the serial killers. Because with each additional murder, their psychology and methods are akin to undergoing a tempering!"

"Often, I refer to such killers as evolution!"

"Evolved killers exhibit more mature behaviors. But in serial murder cases, there’s a distinction between being proactive and being forced. Some killers evolve internally during subsequent crimes. But some, due to external factors, are forced to make a seemingly more correct choice."

"That choice occurs in a highly tense environment with time pressure and the possibility of being discovered, but if he ultimately succeeds without being discovered, his mind enters another distorted realm."

"He would feel like even heaven is aiding him, so all he does represents correctness!"

"That mindset makes him more arrogant, like the Ye Jun Chen Xiao encountered today!"

Among three people walking together, there must be someone who can teach me.

At this moment, Chen Xiao felt a sense of admiration for Cao Xiuyuan.

"So Captain Cao still thinks that in the midst, a coincidence possibly occurred, forcing the killer to handle things differently than before?" Chen Xiao asked with a smile.

Cao Xiuyuan uttered an affirmative sound: "Yes, for the current killer, that coincidence was favorable for him, but it was a stroke of luck, as akin to accidental wealth."

"Someone becoming rich overnight gets good fortune, the benefit is that he no longer has to be poor that night. But the downside, if he does not have absolute financial management skills, the accidental wealth can lead him into a bigger abyss!"

Chen Xiao couldn’t help but applaud, laughing:

"Then simplifying Captain Cao’s words, is that when the killer murdered Officer Dou, he might suspect he was discovered. But ultimately it’s possible there were other factors, making him think he probably wasn’t discovered."

"However, to be safe, this accident still prompted him to make another choice, just like the windfall Captain Cao mentioned!"

"Based on Captain Cao’s analysis, we can completely spread the net wide, to see if there really exists someone who caused that accident. Once we find that person, it means the killer’s initially incomplete alibi, will, due to that person’s involvement, have a fatal flaw!"

Cao Xiuyuan nodded with a smile: "Yes, that is exactly the principle."

Qin Fei and Sun Zhou also suddenly understood, but soon Qin Fei frowned again:

"But Officer Dou’s death is still being heavily controlled in terms of its impact. If we go looking for that person, then I fear the impact will become uncontrollable."

Cao Xiuyuan let out a long breath: "Capture the thief to catch the king, seize the thief to secure the loot, Ye Jun understands the logic, we can’t not understand. Without evidence, we can only ever suspect him!"

"Now there’s a very good method to find evidence, I don’t want to give up, so I will handle the matter with the superiors, moreover, I am the team leader of the special task force, and I should bear both the good and bad results of the investigation of the case."

Hearing Cao Xiuyuan’s words, Chen Xiao didn’t say anything.

He thought this was the best method to find evidence at the moment, even though it contained some wishful thinking.

But this wishful thinking is based on the inferred criminal psychology of the killer.

If they don’t try, they can only remain in a passive position.

After deeply looking at Cao Xiuyuan, Chen Xiao smiled at him:

"Go ahead, Captain Cao, if this method ultimately doesn’t bring good results, but as long as we find one person, then it can balance out, even outweigh any negatives!"

Cao Xiuyuan’s eyes brightened, and he laughed: "You’re talking about... the one holding the knife!"