Diary of a Criminal Investigator

At the time, Dong Jun was very calm when questioned by the police.

Like the other neighbors, he displayed emotions such as nervousness, fear, and curiosity.

However, when he heard the police in the hallway discussing that Qin Weiwei had been murdered and did not die of natural causes, his heart nearly stopped.

Dong Jun couldn’t believe that his murder method, which he had planned for three years, was seen through by the police in just a few minutes.

At that moment, he was almost scared to death.

In fact, there are significant cognitive barriers between different professions.

For instance, Lu Chuan and others couldn’t figure out how Dong Jun managed to commit a locked-room murder.

Dong Jun was also unaware that the changes in a corpse after death could provide a lot of useful information to the police.

Although the person is dead, the body still speaks.

In truth, Dong Jun was very cautious and meticulous in everything he did.

Even with Lu Chuan’s crime scene investigation skills, there were very few valuable clues discovered on site.

But he should never have moved the corpse after Qin Weiwei’s death.

The grid marks imprinted on the back of the corpse from the bathroom tiles exposed everything.

As a result, Lu Chuan became suspicious.

Next, they conducted a focused investigation of the bathroom.

This led to the discovery of words written by Dong Jun on the mirror.

Wang Zhaokai answered Dong Jun’s question: "The initial death scene for Qin Weiwei was in the bathroom."

"At the time of Qin Weiwei’s death, her back was on the ground, so her back bore grid marks from the bathroom tiles."

"Even though you moved the body, these grid marks wouldn’t disappear; in fact, they become more distinct over time."

"Since someone moved the body, it indicates that someone had to have been at the scene after Qin Weiwei died."

"Is that how it is?"

Dong Jun understood.

If he hadn’t acted out of a momentary impulse and hadn’t done what he did afterward...

there would’ve been nothing.

Perhaps things would have truly passed by unnoticed.

Indeed, had Dong Jun not moved the body at that time, the case might well have gone unsolved.

The whole scene was sealed: the door was locked from the inside, the windows were also locked, and the official cause of death was a brain hemorrhage.

The hospital records supported a relevant history of brain conditions.

Everything appeared to be perfectly logical.

However, there are no "what ifs" in real life.

Dong Jun thought he had done everything flawlessly, yet it ultimately led to his capture.

"Dong Jun, after committing the act, how did you leave the scene and lock the door from the outside?"

"This..."

"Actually, it’s quite simple..."

Among all the steps involved in the murder, Dong Jun considered creating the locked-room scenario to be the simplest.

The lock on Qin Weiwei’s door was a standard mechanical one without any automatic mechanism; to lock it, you only needed to turn the button on the inside.

Dong Jun tied a slipknot to the lock button.

"The old type of security doors don’t seal all that well; you can pull a string through the side, close the door, and with a sharp tug, the door locks."

"Because I tied a slipknot, the string end outside could undo it with a strong pull, then you could remove the string, and invisibly the door was locked."

The murder motive, the execution, and the creation of the locked-room were all clearly explained by Dong Jun.

At this point, the case was considered successfully solved.

In the office of Squad One.

"Brother Wang, I investigated the incident where Dong Jun’s child died back then, and it seems..."

Dong Jun’s murder of Qin Weiwei stemmed from an accident five years ago.

At that time, after Dong Jun’s child died, there were accusations that Qin Weiwei had failed to help.

But in reality, Qin Weiwei’s friends said they were simply taking photos and didn’t notice the child.

"After Dong Jun’s child died that year, his wife divorced him."

Wang Zhaokai also examined the situation back then; indeed, Dong Jun had a tough break.

That year, his son died, his wife left him, and he was scammed in home renovations, owing over a million in construction fees.

As Dong Jun said, he almost jumped off a building.

"Actually, I think the blame lies with Dong Jun; how could he leave such a young child alone like that and walk away? Who else is there to blame?"

"It seems to me that back then he wasn’t fulfilling his basic parental duties."

"Even if Qin Weiwei and her friends hadn’t been busy taking pictures, they would have had no obligation to save the child anyway."

"Dong Jun just gave himself an excuse."

"It shouldn’t be said like that, Dong Jun is the child’s father, and losing the child was harder on him than anyone else."

"Besides, when we were kids, who looked after us? Didn’t we run wild outside every day without anything happening?"

Everyone shared their thoughts in conversation, with a variety of perspectives.

The incident from five years ago cannot be neatly attributed to right or wrong.

But for Dong Jun to lay the blame for his child’s death on Qin Weiwei, well, that’s truly misguided.

And this guy, he’s truly ruthless.

Three years!

He lived as neighbors for three years, helping out with everything big or small, just to get closer.

Then he planned the murder.

Dong Jun’s psyche is possibly flawed in some way.

The case had a breakthrough; upon learning the situation, Lu Chuan immediately reported to the precinct.

Dong Jun’s method of creating the locked room was simple, yet before one understands, it remains unfathomable.

It was the first time Lu Chuan handled such a case.

The remaining work was straightforward—the documentation of the case.

In the previous murder case, Lu Chuan had followed through the entire process, so he was already familiar with assembling these sorts of documents.

This made supervising and reviewing far more efficient.

Of course, the storm around the case hadn’t fully subsided yet.

Lu Chuan heard that all the residents of the community where the incident occurred recently changed their locks.

Online, there were still some rumors circulating.

But with time, they’ll eventually die down.

The members of the Criminal Investigation Team finally managed to get some well-deserved rest.

For this case, over a hundred people in the Criminal Investigation Team worked tirelessly over three days without pause.

Lu Chuan and a few heads of squads barely managed three to four hours of sleep a day.

Now that the case is finally resolved, there’s no need for overtime.

Tomorrow morning, they plan to take Dong Jun to identify the crime scene, after which they’ll hand him over to the detention center.

Once the court proceedings and specific sentencing conclude, he will be transferred to prison.

However, Lu Chuan suspects that Dong Jun won’t be in prison for long.

Given his circumstances, execution seems inevitable.

The odds for a suspended death sentence are slim.

After all, he spent three years planning this, revealing a firm intent to kill with extremely malicious intent, and even dishonored the corpse afterward.

After all this busy work, a week had passed.

Yet Lu Chuan hadn’t rested for a few days when the Criminal Investigation Team received a report.

A middle school student had been missing for two days.

The parents had searched for a whole day, asking the school and classmates, but the child was nowhere to be found.

Upon receiving the report, Lu Chuan and his team immediately rushed to the scene, in East Valley Town, South Suburb of the High-tech Zone.