Chapter 154 Double Clues: Evidence Under the Fingernails

"Has your daughter behaved abnormally recently?"

"Nothing unusual, she goes to work and comes home normally every day. However, Xiaoning had a boyfriend some time ago, and she often goes out to date that boy and comes back late at night, and sometimes doesn't come back at all." Sun's mother said, "We thought she was an adult, so we didn't interfere much in her friendships."

"When did she get a boyfriend?" Fang Rui asked.

"About two months ago."

"Boy? She said her boyfriend is a boy?" Xiao Zhang confirmed again.

Wang Yonghua is more than ten years old, so it's impossible to describe him as a boy. Could the boyfriend Sun Xiaoning mentioned be someone else?

"Yes. That's what she said." Sun's mother thought of something and added, "Xiaoning has been acting strange recently. She suddenly became very rich and bought a lot of luxury goods and a car. I asked her where the money came from, and she said she made it from stock trading, and said that we would soon live a good life. Did she do something illegal? How could a girl like her suddenly make so much money?"

"We are still investigating."

Xiao Zhang asked, "Do you know about your daughter's affair with Wang Yonghua?"

Sun Xiaoning's parents looked confused: "What Wang Yonghua? We have never heard of this person."

"Didn't your daughter mention this person?"

"No."

"Have you ever met your daughter's boyfriend?"

Sun's father said, "No! My daughter didn't show us any photos. She seemed to like that boyfriend very much, but when we asked her about the boy's background, she refused to tell us."

Sun's mother covered her face and burst into tears, "It's all my fault. I was too careless. How could a girl like her suddenly have so much money? She must have obtained the money through abnormal means. Wuwuwu, when she was out early and back late, why didn't I talk to her properly and learn more about her situation?"

Sun's father also started to cry in self-blame.

Xiao Zhang hurriedly handed them tissues.

In the autopsy room.

The female victim had no other external injuries except for the grooves on her neck and a few scratches on her back, and no signs of resistance.

"At the time of the crime, the victim should have crawled into the car to find something, and the murderer strangled her neck from behind and quickly strangled her to death." Chen Xue analyzed, "The scratches on the victim's back should have been caused when she had sex with the male victim. No wonder there is dandruff in the male victim's fingernails."

Mu Mian and his team have extracted all the dandruff tissue in the gaps between the victim's fingernails. Mu Mian found that there seemed to be two types of dandruff in the victim's fingernails. One is white and delicate, and the other is rough.

The male victim's injuries were more complicated. There were bruises on his body caused by resistance, multiple contusions on his head, and his forehead skull was shattered.

Mu Mian cut open the male victim's scalp and found that there were depressions in his forehead, left parietal and left temporal skull, and severe intracranial injuries.

Mu Mian and Chen Xue carefully observed the morphology of the depressed fractures. There were five depressed areas in total. The depressed areas were very narrow and had a certain curvature.

Mu Mian had read the autopsy reports of most domestic cases, and she found that she had seen similar wound morphology, and the weapon that caused the injury was a large wrench.

"The weapon that caused the injury could be a large wrench." Mu Mian said.

"Yes, if you hold the wrench sideways and hit it down, it is possible to cause this kind of injury." Chen Xue agreed.

Mu Mian wiped the blood off the skull again to examine the wound further. At this time, she found some black things in the sunken areas.

She wiped them with a cotton swab and observed them carefully.

"This should be engine oil! When I was a kid, the chain of my bicycle fell off, and I fixed it myself, and my hands were covered with engine oil." Chen Xue analyzed, "Why is there engine oil on the wrench? Ah, this wrench is most likely used to repair the car! But most people don't put wrenches on their cars. Even if there are wrenches, they won't be stained with engine oil unless they are used to repair the engine. Unless the murderer brought it himself."

Chen Xue found that Mu Mian was looking at her quietly, and she began to doubt herself: "Mian Mian, am I wrong?"

"Chen Xue, I found that I lack some common sense in life. I don't know what you said. I don't have a bicycle, and I haven't lost a chain. I don't have a car yet." Mu Mian sighed.

It seems that she should watch more TV series. A few days ago, Fang Rui's mother recommended her a lot of family ethics dramas, saying that they could expand her ideas for solving cases. Mu Mian didn't want to watch them at first, but she felt that she needed to learn some common sense.

"Mian Mian, this is the necessity of the team. We all complement each other!"

At the morning meeting the next day, Mu Mian reported the autopsy results.

"Both victims died on the night of June 23rd, which was the night before yesterday, between 10 and 10:30."

"The cause of death of the female victim, Sun Xiaoning, was strangulation. We detected semen on her body that belonged to Wang Yonghua. There were three scratches on her back, which were caused by Wang Yonghua, because some of the dandruff we found in Wang Yonghua's fingernails belonged to Sun Xiaoning."

Mu Mian continued, "The cause of death of the male victim was brain damage, which caused subarachnoid hemorrhage. The murder weapon was a wrench, and the wrench should have been stained with motor oil."

Fang Rui asked, "Who does the other part of the dandruff in Wang Yonghua's fingernails belong to?"

"That's a good question," Mu Mian said excitedly, "The dandruff in the victim's fingernails belongs to two people, and the other person should be a man."

"Could it be that the deceased scratched the murderer when he resisted?" Xiao Zhang analyzed.

Mu Mian retorted: "If so, why didn't the murderer clean up the traces? Or simply cut off the deceased's fingers and took them away, so that there would be no evidence left."

The murderer was too careless to make such a low-level mistake.

Chen Xue said, "Could it be because he killed on impulse and didn't think too much? Cases of passion killings basically leave a lot of evidence."

Xiao Zhang had a bolder guess, he said, "Who is the biggest beneficiary of Wang Yonghua's death? It must be his wife! Could it be that his wife hired a killer? I feel that his wife is not sad or surprised about his death, as if she knew he would die. If it was a professional killer, he would definitely not be afraid of leaving DNA evidence, anyway, he would run away after doing this job."

"If it was his wife who hired the killer, shouldn't he have tortured Sun Xiaoning severely? Generally, women hate mistresses the most, but the murderer just strangled Wang Xiaoning to death." Chen Xue analyzed, "I think the murderer seems to hate Wang Yonghua more."

"But Wang Yonghua's wife seems to have a good relationship with Wang Yonghua's lovers. She still has their contact information. She doesn't seem to care about Wang Yonghua's women."