Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

At the junction of the door frame and the wall, there were traces of soil detachment. The edges of the detached area were neat. Considering the degree of decay of the door panel, it was initially determined to be a natural detachment, unrelated to the case. No fresh fingerprints, footprints, or wiping marks were found on the outer surface of the door panel. Near the door on the ground, there was a fragmented shoe print. The shoe print was light gray, made of rubber, and the pattern was blurred. Only the general outline could be identified. The shoe size was approximately 42. It was impossible to extract complete footprint features. It is speculated that the footprint was left by an unrelated person or that the suspect deliberately destroyed the footprint when entering or leaving.

Upon entering the main house, the investigators first conducted an overall observation of the interior environment. The floor was compacted earth, covered with a thin layer of dust (approximately 0.1-0.2 cm thick) due to long-term vacancy. The dust distribution was uneven, with a thinner layer near the doors and windows and a thicker layer in the center and corners. There were no tables, chairs, beds, or other furniture inside. Only in the west corner of the main house were a small amount of discarded crop stalks, old clothing, and some miscellaneous items piled up neatly without any signs of disturbance, initially determined to be unrelated to the case.

The body was located in the center of the main room, lying supine with the head facing due north and the feet facing due south. The limbs were naturally extended, and the body was slightly tilted to the left. The deceased was wearing a black long-sleeved cotton T-shirt with a large area of ​​dark red staining on the chest. The stained area was irregular in shape, with blurred edges, and covered an area of ​​approximately 30 x 25 cm. The collar and cuffs of the T-shirt were intact and showed no obvious signs of wiping. The deceased was wearing dark blue jeans with no obvious damage or bloodstains. Black socks were intact and undamaged. The deceased was not wearing shoes.

Yang Lin instructed his team members to use a measuring tape to precisely measure the position of the body. They recorded the horizontal distance from the center of the body to the main house door as 4.2 meters, to the north wall of the main house as 3.8 meters, to the west wall as 2.5 meters, and to the east wall as 3.1 meters. They also measured the body's length, shoulder width, and other basic data for subsequent identification. Because the focus of this investigation was on extracting traces and physical evidence, and to avoid forensic-related details, no external examination of the body was conducted; only a detailed examination of the traces surrounding the body was performed.

Beneath the body, there was a large pool of dark red blood, irregularly oval in shape, approximately 80 cm long and 60 cm wide, with a thickness of about 0.5-1 cm. At the edge of the pool, there were a few circular bloodstains, about 0.5-1 cm in diameter, dripping vertically. It is presumed that these were formed by blood dripping from the wound after the victim was injured. Around the pool, there were a few wiping marks on the ground. These marks were strip-shaped or patchy, randomly oriented, and approximately 3-10 cm long and 1-3 cm wide. Preliminary assessment suggests these were formed by the victim struggling after being injured, causing friction between the body and the ground, or by wiping marks left by the suspect when moving the body.

Using a footprint lamp, Yang Sen meticulously illuminated the ground surrounding the pool of blood, discovering two complete shoe prints on the eastern side. Both prints were made of rubber, were dark gray, and had clear, diamond-shaped patterns. The shoes were size 43. The two prints were parallel, approximately 40 centimeters apart, with slight bloodstains around the edges, matching the color of the blood on the ground. Preliminary assessment indicated they were footprints left by the suspect during the crime. Yang Sen used plaster to fix and extract the two shoe prints, while simultaneously using a camera to photograph them from different angles, noting their location, orientation, and size.

On the ground north of the pool of blood, a trace of a sharp object was found. The trace was linear, approximately 12 cm long and 0.8 cm wide, with clean edges and a depth of about 0.1 cm. Magnifying glass revealed a small amount of metal residue on the surface. Preliminary assessment suggests it was formed by the sharp weapon falling to the ground, or by the blade rubbing against the ground when the suspect swung the weapon. Yang Lin carefully used tweezers to remove the metal residue from the surface, placing it in a sealed bag and labeling the location and time of extraction for subsequent laboratory testing to determine the metal material and the type of knife.

Below the right hand of the body, an irregularly shaped metal fragment was found on the ground. The fragment was silvery-white, approximately 2 x 1.5 cm in size, and about 0.2 cm thick. It had sharp edges and a small amount of bloodstains on its surface. Under magnification, the fragment showed fine scratches. It was preliminarily determined to be a fragment of a murder weapon or an item carried by the suspect, possibly a fragment of a knife guard, or a metal fragment from clothing or jewelry. Yang Lin extracted the metal fragment, placed it in a sealed bag, and marked it. He also conducted a thorough examination of the surrounding ground, but no other related fragments were found.

Subsequently, the investigators examined the interior walls and roof of the main house. The walls were made of adobe bricks, with a rough surface and multiple cracks and peeling marks. These peeling marks were all formed by natural aging, with no fresh signs of impact or wiping. There were no traces of blood, fingerprints, or other physical evidence on the walls. The roof was a wooden beam frame covered with tiles, some of which were damaged. There were no fresh signs of trampling or climbing, and no foreign objects had fallen from under the roof. The preliminary assessment was that the suspect had not left any traces on the walls or roof.

The main house has two windows, one on each side of the south-facing door and the other in the center of the north-facing wall. Both are wooden windows, with severely decayed frames and sashes. The sashes lack glass, only having simple wooden window frames, which are closed but unlocked and can be easily pushed open. Yang Lin and Yang Sen led their team to conduct a detailed examination of the two windows. On the window frame of the left south-facing window, they found a fresh, irregular footprint. The footprint had a small amount of soil residue on the surface, consistent with the composition of dust on the ground. The edge of the window frame showed slight wear. It was preliminarily determined that the footprint was left by the suspect when climbing the window.

Illuminating the ground around the left-hand window on the south side with a footprint light revealed a fragmented shoe print. The print's pattern and size were roughly identical to the suspect's shoe print found east of the pool of blood, with only the toe section missing. This suggests that the suspect entered the room through the window, leaving a footprint that further confirms that the suspect likely entered the scene through that window. No fresh traces or physical evidence were found on the window panes or frames of the right-hand window on the south side and the north-hand window, and no footprints, fingerprints, or other clues were found on the ground around the window panes.

Next, the investigators examined the east wing room. The wing room was approximately 15 square meters in size, with a compacted mud floor covered in dust, the same thickness as the main room. There were no fresh footprints or signs of wiping. The wing room contained no furniture or miscellaneous items, only a small amount of weeds in a corner. The weeds grew naturally, without signs of being trampled or disturbed. The walls and roof of the wing room were unremarkable, and the doors and windows were intact, showing no signs of recent activity. The preliminary assessment was that the wing room had not been used by the suspect and was unrelated to the case. (End of Chapter)