When she said that, the others guessed it too, and their faces immediately turned pale. Many of them even gagged, but being men, they were more tolerant than Su He and didn't vomit.

After everyone had calmed down, Captain Yu said with a grim expression, "You mean, Feng Jianguo found out that his biological father was killed and then... so he had the urge to kill Feng Weikun?"

Su He nodded. "Old Mrs. Feng was already confused before she died, and she liked to talk nonsense. It's normal that he might have overheard something she accidentally said."

That's why he left in a huff, and his subsequent return was probably to hide and wait for the most opportune moment.

Captain Sun nodded in agreement. "It's not impossible. I'll interrogate him again later. Now that we know there's a suspected murderous intent, I don't believe we can't get him to talk."

At this point, Captain Sun's face turned fierce, and he exuded a menacing aura, which even made Su He a little afraid.

If Feng Jianguo really is the murderer, he probably won't last long.

Sure enough, in the afternoon, Feng Jianguo confessed, admitting that he was the murderer who killed Feng Weikun.

In fact, the moment Su He and the others guessed the murderous intent, he immediately lost his composure and spoke, showing just how angry he was about the matter.

That's exactly right. After unexpectedly hearing that his father had died, had his flesh cut off, and even been eaten by his stepmother and younger brother, he wanted nothing more than to kill them!

But at that time, Old Mrs. Feng was not far from death. Perhaps she had committed too many sins in her life, and she was confused before she died. She was suffering every day, so he did not take action.

To prevent his younger brother from finding out, he pretended nothing had happened, and then slowly looked for the most suitable opportunity to kill him and avenge his father.

It wasn't until that business trip that he felt the time was right. First, he spent money to find someone to stop Yang Shi from going on the business trip with him. Then, after having dinner with his colleagues to create an alibi, he waited for Yang Shi on his way to the train station.

Then, they found a secluded spot and pretended to bump into each other by chance. After exchanging a few pleasantries, they handed him a steamed bun that had been laced with a large amount of mercury.

Feng Weikun was unaware of his brother's thoughts. He assumed they were close and that his brother was just concerned about him, so he didn't think much of it and simply ate the food. Then the two parted ways.

Not long after he started walking, Feng Weikun developed symptoms: dizziness, headache, unsteady gait, and eventually collapsed to the ground.

Then Feng Jianguo returned and threw him into the river where no one was around.

The method of the crime was very simple. Feng Jianguo was an employee of a chemical plant, so it was normal for him to come into contact with mercury. Even a small amount of this substance would be an excessive dose for the human body.

Although they won't die immediately, the onset is rapid, and they won't struggle, so they won't be discovered.

The reason he chose to act now was to take advantage of the time difference caused by his business trip, so that people wouldn't discover it immediately.

After a few days, the body had already decomposed, and even if it were found, it would be difficult to spot without careful examination.

Of course, the same reason is why they are not allowed to dissect corpses.

As for that briefcase, it did indeed belong to Feng Weikun.

It is said that there was still a lot of money and documents in the briefcase at the time. He kept the money for himself and burned the documents. The only reason he didn't throw away the briefcase was because he couldn't bear to part with it. Feng Weikun had shown off to him more than once, saying that only leaders were entitled to such a thing, so he secretly kept it.

Su He and his group later found the thief who attacked Yang Shi based on the clues he provided. It turned out to be a local hoodlum.

After he was arrested, he admitted that he had taken fifty yuan from someone to do the job, but because the person had disguised himself when he contacted him, he did not know if it was Feng Jianguo.

With that, the case was finally solved.