In Yang Feng's opinion, unless Liu Yuanyuan knew this, it was already very late, and it was even too late for her to ask Liu Jing to change the sofa or floor at home, so she was "invited" by the police into the police station.

In other words, it is very likely that it was not until the last few days that Liu Yuanyuan knew that He Shuangxi was killed by a rod in Liu Jing's house.

It can be seen that the person who called Liu Zhaodi at that time and asked her to help dispose of He Shuangxi's body would definitely not be Liu Yuanyuan, but the old lady of the Liu family.

This shows that the assumption that the old lady killed or participated in the killing of He Shuangxi is very likely to be true.

Therefore, the blood stains on the wooden frame at the bottom of the sofa are most likely left by the old lady.

Lao Qin seemed to see what Yang Feng was thinking, and reached out and patted him on the shoulder: "Don't rush to conclusions, let's wait for the DNA comparison results to come out."

Then, Lao Qin walked to the autopsy table and began to dictate the autopsy results on the two corpses of the two brothers of the Yuan family:

"Yuan Shiwen has a ring-shaped incision (wound) at the base of his left thigh, the surrounding skin and muscles have been cut, and only one bone is connected to the limb, and the wound has no life reaction, mainly manifested as no bleeding from the wound and no curling of the wound skin, that is, this wound was formed after death."

"Dense small cuts can be seen on the femur at the bottom of the wound, and there are also femurs at the bottom of the circumferential wound."

"Looking at the shape of the wound again, the wound edge is neat and fine, indicating that the injury tool is sharp and not large. Judging from the cut marks on the femur at the bottom of the wound, it indicates that the mass of the causal tool is not large."

"In other words, after Yuan Shiwen died, the murderer held a sharp knife and repeatedly cut the base of the corpse's thigh, almost cutting off the thigh, probably trying to dissect the corpse."

"But the murderer didn't have medical knowledge, or anatomy knowledge. The reason why he or she cut at the base of the thigh is probably to dismember the thigh. But the base of the thigh is not where the femoral head joins the pelvis, it's just the middle and upper part of the femur."

"When the murderer dismembered the body and divided the femur, it was not moved. The femur was thick and so strong that it was obviously impossible for the knife used by the killer to dissect the body to cut it off. Therefore, the murderer simply did not cut it, and directly put the body into a sack and sank it into the reservoir."

The forensic doctor pointed to the root of the left thigh of Yuan Shiwen's corpse on the stage, and explained to Yang Feng and others.

This finding is in line with what Liu Zhaodi and Liu Jing said: they both said that the first way they thought of disposing of the corpse was to break up the corpse and then bury it, but after only a few cuts, they found that the corpse was too difficult to cut, so they simply gave up this method.

Liu Yuanyuan is a doctor herself, and she is naturally no stranger to human anatomy and human anatomy. But she claimed that she suddenly came to her menstrual period at that time, and her stomach hurt badly, and she really didn't have the energy and heart to do this delicate work of splitting the corpse, so after cutting the base of Yuan Shiwen's thigh a few times, she dispelled the idea of splitting the corpse, and instead thought of sinking both corpses into the reservoir, which was a simple and easy way.

But Lao Qin's conclusion made this part of Liu Yuanyuan's confession very unbelievable: as a doctor, it was impossible for her not to know that it would be difficult to dismember her thigh by incising her thigh from the root, which was inconsistent with her identity as a doctor.

In other words, the person who really tried to dissect Yuan Shiwen's body was not Liu Yuanyuan, and she should not have been at the scene when the dismemberment occurred, otherwise she would have put forward professional guidance.

It can be seen that it is very likely that it was not Liu Yuanyuan who killed the two brothers of the Yuan family, and at least when the body was divided, she did not know that her brother or sister wanted to divide the body and bury it, and it is even possible that at this time she did not know that the two brothers of the Yuan family were dead.

Combined with the fact that Liu Yuanyuan did not ask Liu Jing to change the sofa or floor at home in time, the three sisters and brothers really realized "information sharing", and took out all the death process and relevant information of Du Juan, He Shuangxi, and the Yuan brothers for communication, or the time of their "collusion" at least occurred after the failure of the dismemberment, which was not a few days before the police would take them to the police station.

In such a hurried "collusion of confessions", when they had not yet reached an agreement on the purpose of the confession of "who should bear all the charges", they were suddenly served by the police.

At that time, Yang Feng instructed the investigators to secretly collect relevant information about the three sisters and brothers of the Liu family, and on the surface, they investigated the disappearance of the two brothers of the Yuan family with great fanfare.

In case the police find out that we are the real murderers of the Yuan brothers, and even find out the deaths of He Shuangxi and Du Juan, it is better to fold only one than let the family of four (including the old lady) fold it in.

Of course, the premise of doing this "plan" is that this family of four has their lives on their backs.

Because of this, the next situation arose that the three sisters and brothers rushed to take care of everything as soon as they entered the police station, and insisted that all the crimes were committed by themselves.

In addition, according to the confession of the three sisters and brothers of the Liu family, the police responsible for salvaging the body found a small wooden boat on the edge of the reservoir, which was originally used by relevant personnel to regularly clean up white garbage or other household garbage on the water, so it was usually docked on the shore, but it was used to throw the body.

The three siblings of the Liu family claimed that after transporting the body to the edge of the reservoir, they then carried the body onto the small wooden boat, and finally rowed the boat into the reservoir, from which the body sank into the water.

Yang Feng nodded, signaling that he understood, and let the forensic doctor continue.

"The two corpses had different lengths of hair and a pitted hairstyle, which should have been deliberately cut like this. At the same time, the corpses were all naked, with large strip-shaped wounds on the chest, back, and even on the head, which should have been whipped with a belt or whip before death."

"Both bodies had several punctate wounds on their heads, the difference is that Yuen Shiwen's head has three punctate wounds, while Yuen Shijie's head has four wounds. These punctate wounds have the same morphology and equal distance, and there are obvious life reactions, which are ante-mortem injuries."

"This must be caused by a farm tool like a rake, right?" Yang Feng interjected and asked.

The medical examiner nodded and continued, "The two bodies also had several scalp lacerations on their heads, which were caused by blunt force blows, but did not cause skull fractures, only scalp injuries. It's also a pre-mortem injury."

"Hit with a brick?" Yang Feng asked again.

"The wound after the brick is struck with this characteristic." The medical examiner gave a very rigorous answer.

So far, the confessions of the three sisters and brothers are in line with Lao Qin's judgment on the autopsy.

"Belts, rakes, bricks, where are the fatal injuries?" Yang Feng threw out his biggest question.

Lao Qin unhurriedly pointed to the bodies of the two corpses:

"During the autopsy, it was found that the two deceased had multiple subcutaneous hemorrhages on the front and back of their chests, and these injuries were consistent with the characteristics of the deceased caused by the belt whipping. Belt whipping can also be fatal, such as crush syndrome, but crush syndrome requires extensive subcutaneous bleeding on the body. This little subcutaneous hemorrhage on the two deceased was far from enough to cause death."

This means that Liu Jing is not the real murderer of the two brothers of the Yuan family.

Then, Lao Qin pointed to the heads of the two corpses:

"These blood holes, that is, these dotted wounds, do not even leave a single mark on the skull, and such injuries are completely incapable of killing people."

Yes, Liu Zhaodi is not the real murderer, it can't be Liu Yuanyuan, right?

"A scalp laceration caused by a blunt instrument, as I said earlier, did not cause a skull fracture, at most it can only be regarded as a skin injury, and it is not enough to cause death."

Not only were Wang Xing and Wu Xiaojun stupid, but even Yang Feng was confused: "None of these three sisters and brothers are murderers? The two brothers of the Yuan family will not commit suicide, right?"

Lao Qin shook his head, dragged the waist of one of the corpses, and lifted it up so that everyone could see his waist:

"The corpse spots of both corpses are flaky, located in the uncompressed part of the lower back, and many small stone-like indentations can be seen on the surface of the skin on the lower back. Saw it all, right?"

The three nodded in unison.

"At the same time, extensive subcutaneous hemorrhage areas were visible on the outside of the two deceased's upper limbs, many small superficial scratches were visible on both hands, and suspected rust-like foreign bodies could be seen in the wounds."

Then, Lao Qin took out a bunch of photos and handed them to Yang Feng.

"This is the result of the identification of the pigsty where the two deceased were held before their death, that is, the scene of the crime."

"The pigsty is close to the mountain, located at the back of the residential house, and the location is extremely secluded, it is a brick and wood structure, with complete windows and roofs, and the space is closed, and there is only a heavy wooden door on the south side for entry and exit."

"Although it is called a pigsty, it does not keep pigs or other animals in captivity."

"Once you enter the door, you will find a pedestrian walkway, and on the right side of the passage is a 1-metre-high fence separating the passage from the pigsty. There was a layer of gravel on the floor in the aisles and the pigsty, and there was a large blood stain in the center of the pigsty. The knife that dismembered the corpse was next to the bloodstain and was an ordinary fruit knife. Trying to dismember a corpse with such a knife, this man is obviously an 'amateur'."

"The bloodstains on the ground and the bloodstains on the fruit knife are consistent after comparison, so this bloodstain should be left when the body was dismembered."

"There is a window on the north side of the pigsty, and in order to make the pigsty as good as possible for lighting and air convection, this window is opened higher and larger, about two meters from the ground, and the window rails are rusted rebar."

"There are traces of footsteps on the wall below the window, which are barefoot. There are many dusty palm prints on the windows and eaves, and there are also barefoot footprints on the eaves on both sides."

Finally, Lao Qin pointed his finger at the deceased's head: "Both deceased have a contusion area about the size of a walnut on their occipital parts, and there are rubble attached to the wound, which is basically the same as the gravel on the ground."

"This abrasion contusion on the occipital part of the two deceased corresponds to a hedged brain contusion on the forehead. This type of injury is more common in falls, stumbles, or falls."