Ren Qiushi and Zeng Lan's on-site autopsy work found some doubts that could not be explained for the time being, but these doubts were not absolute. In a given environment, strangulation with a string does not necessarily mean cutting a muscle or neck artery or vein.

Ren Qiushi took off the strings, put them in the evidence bag and handed them to me.

"Can you tell what this thread is?" I handed the evidence bag to the deceased Ning Xiaobai's personal teacher, Zhang Yajing.

Zhang Yajing took the evidence bag in my hand, distinguished it a little, and immediately said to me: "This is the piano string, and it is the alto string." ”

"Oh? Are you so sure? I looked at her in amazement.

Zhang Yajing nodded and said to me: "The bass strings of the piano will be wrapped with copper wires on the outside, and the alto and treble strings are bare strings, and the treble strings will be thinner than this alto string. ”

I looked at Zhang Yajing and continued to ask, "What is the material of this piano string?" ”

After listening to this, Zhang Yajing carefully identified the strings in the evidence bag in her hand, and then said lightly: "The strings of the piano are all made of carbon steel with high purity, which is very malleable. This string is German

Oslau brand, this brand of strings with strong toughness, flexible rebound rate, accurate pronunciation, not easy to break, never rust, and will not produce adhesions, good resonance performance when playing, beautiful sound quality, is the standard configuration of many top pianos. ”

"Miss Zhang is worthy of being an expert, and she can get so many clues with the naked eye." I smiled and withdrew my bag of evidence.

Zhang Yajing smiled awkwardly and said casually: "This is my profession after all." ”

"When was the last time you saw Ning Xiaobai?" I handed the evidence bag to Jiang Tingbai beside me, and then continued to ask.

"Today is Sunday, and the last time I saw her was on Wednesday." Zhang Yajing said lightly.

Judging by the mood she had spoken to me, she had largely stabilized now.

"How is Ning Xiaobai's character? Has there been anything unusual lately? I nodded, and continued to ask.

"Her personality ......" Zhang Yajing's voice slowed down slowly, answering my question while thinking.

"She's a bit of an introvert, she's preparing for the graduate exams at the end of the year, and she's not going to be a few months away, she's under a lot of pressure, and I can clearly feel that she's not in a very good mental state, she's acting anxious." Zhang Yajing said slowly.

"Does she have any mental illness or mental illness?" I asked a very crucial question.

Zhang Yajing shook her head a little sneeringly, and said quietly: "I don't know much about this, I just feel that she is very depressed and very painful. ”

"Is she suicidal then?" I looked at Zhang Yajing seriously and continued to ask.

"Suicidal tendencies?!" Zhang Yajing's eyes had a subconscious widening reaction, and then asked me with an incredulous expression and tone, "She...... Is she suicidal? ”

I didn't answer her question, not only because this question couldn't be answered, but also because there is no accurate conclusion about whether Ning Xiaobai committed suicide or someone else murdered her, and everything can only be known after the forensic doctor conducts an autopsy.

"I need you to go back to the public security bureau with us later, and there are some things that I need to learn more about from you." I thought about it for a moment and said in a deep voice.

After handing Zhang Yajing over to Lin Zifan for a record, I walked into the scene of the crime, where the preliminary autopsy was nearing completion, and the next step was to lift the body onto the corpse truck and take it back to the forensic department for autopsy.

Jiang Tingbai was almost lying on the piano and examined it carefully.

Piano, we have only heard and seen, but we don't know about it, Jiang Tingbai carefully checked every string, and found nothing missing.

So he checked again.

"It looks like this string is a spare string." Li Meng opened a bookcase next to the piano and found several spare strings, each of which was individually packaged, except for one bag that was empty and had no strings in it.

Li Meng was rummaging through the bookcase, when suddenly a sheet music was scattered on the ground.

This is a self-bound sheet music, which is full of some well-known foreign music, as well as some domestic pop music.

It seems that this Ning Xiaobai is indeed an entry, playing the piano just to relieve pressure and cultivate sentiment, and learn whatever song he likes.

The sheet music looks very shabby, and the bindings are not sturdy, with many individual scores scattered out on their own.

The technical team did not find any important clues at the scene, and everything was still the same as the cases we solved in the past.

The words are also the old saying that the mouth is worn out and the ears are calloused, what doors and windows are not damaged, there are no traces of fighting at the scene, and the belongings in the room are not lost.

Although the words are old-fashioned, these are all things that must be checked in the on-site trace inspection work, and they cannot be skipped, because these are the most intuitive clues, and there are also different motives and ways of killing people hidden in them.

Judging from the current clues, this case is a suicide case, and we have no way to know the cause of suicide from the mouth of the deceased, nor can we know from a deceased person the changes in her mood when she committed suicide, as well as whether she has a very serious mental illness and mental illness, and whether she has suicidal tendencies.

So we took away everything that could be used as physical evidence at the scene, including these musical scores, as well as the deceased's mobile phone, computer, books, etc.

The investigation of the scene was relatively simple and easy, and after everything was dealt with, we set up a cordon, cordoned off the scene of the crime, and then returned to the bureau.

What needs to be done now is to inform the family of the deceased and investigate the social relations of the deceased.

At the same time, we also conducted a new investigation and questioning of the deceased's personal trainer, Zhang Yajing. The focus of the inquiry was whether the deceased Ning Xiaobai had serious mental illness or suicidal tendencies.

Forensic doctor Ren Qiushi said that there may be assisted suicide in the case, so Zhang Yajing is the most important suspect.

In the inquiry room, Zhang Yajing sat opposite me without saying a word, waiting for my inquiry.

Zhang Yajing is very beautiful, her beauty is not only in her appearance and figure, but also in her temperament, if it is said that she is born from the heart, then such a beautiful woman, will she be a murderer?

"How is your private relationship with Ning Xiaobai?" I made up my mind and asked her.

Zhang Yajing took a deep breath and replied slowly: "We have a good relationship in private, but she belongs to the kind of person who is very introverted, and we rarely communicate in private, unless it is some piano issues, we will talk a few words." ”