Ren Ping's blood type is indeed AB. This is also quite bad for him.

In addition, the police found that he had two criminal records. One of them is fraud, and the other is fighting with someone. The police took advantage of the time when Ren Ping was detained as an important suspect in the Red Leaf Valley Public Security Bureau, and sent people to forcibly search his room in the "Spring and Autumn Villa". However, no evidence related to the murder of He Shan was found.

Something very important was discovered after this. Tian Lian, a waitress who works at the "Spring and Autumn Villa", handed the police a silver necklace with a pendant attached, saying that Ren Ping gave it to her on the night of the 24th. The pendant has a relief of the statue of Venus, and inside is a picture of the victim's mother. As a result, the police determined that Ren Ping was the murderer and detained him.

Ren Ping's confession during the interrogation was as follows: When I bought snacks from customers in the store, the clock in the store pointed to 6:45. I said, "It's so late," and the clerk looked back at the clock. After coming out of the store, I walked slowly on my way back. As mentioned earlier, I was very tired on this day, and I didn't have a bike, so I deliberately walked a little slower. I had to work again as soon as I got back to the hotel, so why didn't I look at the shop window and take a break? There is a watch shop on the street near the fork to the side road. I'm here looking at the watch in the window for about 5 minutes. My watch is old and I'm looking to get a new one, so I'll take a look. When I happened to look down after reading the watch, I accidentally saw a small white object falling in the corner of the wall. When I picked it up, I realized that it was a necklace with a pendant that a woman wore around her neck. The pendant has a relief of the side face of a Western woman. I think this thing has been here for a while, but it hasn't been found. I looked around and saw that no one was looking, so I put it in my pocket. I didn't meet any acquaintances on the way back. Therefore, I returned to the "Spring and Autumn Villa" a little late. When I got back to the hotel, the aunt next door seemed to say something to me, but I was in a hurry to get in, so I didn't answer her.

I took out the snacks in my pocket and handed them to the waitress Tian Lian, and when I asked her to hand it over to the guest, I wanted to take out the necklace in the other pocket and give it to her. However, I don't think it's a good time to take this thing out, and it's not too late to give it to her later. Tian Lian takes good care of me, and I have a good impression of her. Later, around 10 o'clock in the evening, when I went to the hotel to see if the bath water was hot, I met Tian Lian at the door of the hotel. I took the necklace out of my pocket and said to her, "I picked this up on the road, and if you are interested, I will give it to you." Tian Lian said "thank you" when she received it, and after browsing it, she said: "This seems to be an imported product, and I will treasure it." "It's a fact that I found this necklace in the corner of the watch shop at the front of the trail, and I didn't steal it.

The testimony of the waitress Tian Lian is completely consistent with Ren Ping's confession. When the investigators asked Ren Ping how she looked when she returned to the "Spring and Autumn Villa" before half past seven, she made this statement: "I remember that Ren Ping was a little out of breath at that time, and seemed to be a little flustered. I couldn't think of the necklace he gave me was the drowned woman's thing, so I didn't report it to the police earlier. When Ren Ping was interrogated by the police, I was afraid that I would be affected by carrying such things, so I reported it to the police. When Ren Ping gave me the necklace, he just said, 'I picked this up on the road, and if you are interested, I will give it to you', and there was nothing special about his demeanor at that time. ”

Since there is such strong physical evidence, Ren Ping's suspicion has been basically determined. He was then taken into custody.

The criminal police who found him guilty proved the defendant Ren Ping's guilt with the following points.

1. Ren Ping held the victim's necklace. What they have found is a lie.

2. The semen remaining in the victim's genital-canal is the semen of a man with blood type AB, which is consistent with Ren Ping's blood type.

3. It takes too long for Ren Ping to walk from the "Spring and Autumn Villa" to the store in front of Momiji Valley Station. It usually takes only 50 or 60 minutes to travel, but the actual time spent is 78 minutes. The extra time can be presumed to be the cost of Ren Ping's crime against He Shan.

Fourth, Ren Ping was witnessed by acquaintances on the way there, but not on the way back. According to speculation, Ren Ping's return journey seems to be quite hasty. The aunt of the neighbor of the "Spring and Autumn Villa" once witnessed his demeanor when he returned, and testified that he "came back in a hurry, and did not pay attention to talking to him", and Tian Lian, a waitress at the hotel, testified: "Ren Ping came back with a panicked expression and a little excited. It is not difficult to speculate from the defendant's demeanor after the murder.

Some criminal police officers made this presumption based on the above facts: after Ren Ping walked out of the "Spring and Autumn Villa" at 6:10, he met two acquaintances on the road, and then arrived at the store in front of the station at about 6:40. It took him about five minutes to buy snacks and he walked out of the store at around 6:45 a.m. He probably saw He Shan in front of the station at this time, so he accosted her. The victim, He Shan, took a bus that arrived at 6:10 p.m. and got off at Momijiya Station, then walked across the suspension bridge by 7:05 p.m., probably lingering in front of the station. From the time before and after, there is no doubt that the defendant said that he met the victim on the road in front of the station.

The defendant and the victim did not know each other, but they were interested in it, so they used rhetoric to lure the victim to walk together on the trail leading to the suspension bridge, and walked across the suspension bridge before 7 o'clock, according to the testimony of the daughter of the charcoal shop owner on the east side of the north bank of the suspension bridge, she had witnessed a woman dressed in red walking along the suspension bridge with a man while the TV was broadcasting an advertisement before 7 o'clock. Although the appearance and costume of this man are too dark and distant to be accurately identified, it is not difficult to judge that the woman in red is the victim He Shan, and the man accompanying him is the defendant.

Presumably, after crossing the drawbridge, the defendant took the victim to the grass and asked her to have sex at the same time. Due to the victim's strong resistance, there is a high probability that the necklace was pulled off by the defendant or dropped during the scuffle.

The defendant finally subdued the victim by brute force and violently pursued his bestial desires. The victim may be reluctant afterwards and may claim to report the case to the police station or make a big fuss. At around 7 p.m., the voice of a woman from a nearby scene could be heard. This is proof.

According to the presumption, the defendant, who had the intent to kill, drowned the victim by pushing her into the river from behind. Although the victim had several abrasions on his hands and feet, he was injured when he was pushed into the river from behind as a result of a scuffle with the defendant. After the victim's body flows downstream, it remains at the place where it was found, a dead pool formed by a rocky reef.

It is speculated that the defendant had thrown the victim's handbag into the river, but the current in the middle of the river was quite turbulent, so the handbag was washed downstream without sinking to the bottom and was never found.