Gas poisoning, also known as carbon monoxide poisoning, CO is a colorless, tasteless, odorless gas, and all carbon or carbon-containing substances can be burned when oxygen is insufficient. When using wood stoves and coal stoves, if the ventilation system is not smooth, especially in recent years, the improper use of gas heaters and gas water heaters has greatly increased CO poisoning. Because CO is a colorless, odorless gas, it is called the "silent killer". After inhaling CO, the human body is often unconscious, and even after severe symptoms appear, it still somehow, so that it continues to be in a high concentration of CO environment until death. After CO enters the body, part of it binds to hemoglobin, causing a significant decrease in hemoglobin oxygen transport; The other part directly binds to cytochrome A3 in the mitochondria of the cell, inhibiting intracellular respiration in tissues. Therefore, the clinical manifestations of CO poisoning may not be consistent with the level of HbCO in the blood. The clinical manifestations are mainly hypoxia, the severity of which is proportional to the saturation of HbCO. Mild patients have headache, weakness, dizziness, dyspnea during labor, and HbCO saturation of 10%~20%. The symptoms are aggravated, the patient's lips are cherry red, there may be nausea, vomiting, confusion, collapse or coma, and the HbCO saturation is 30%~40%. In severe cases, he is in a deep coma with hyperthermia, increased muscle tone in the limbs, and paroxysmal or tonic spasms, with an HbCO saturation of >50%. Patients often have cerebral edema, pulmonary edema, myocardial damage, arrhythmias, and respiratory depression, which can lead to death. In some patients, blistering and redness may occur on the skin of the chest and extremities, mainly due to autonomic dystrophy. Some patients with acute CO poisoning will be comatose again after 2~30 days of false recovery after 2~30 days of false recovery, and will have dementia stuporic psychosis, parkin's paralysis syndrome, sensorimotor disorders or peripheral neuropathy and other psychoneurological sequels, also known as acute carbon monoxide poisoning delayed encephalopathy. Long-term exposure to low concentrations of CO may cause headache, dizziness, memory loss, difficulty concentrating, and palpitations. In real life, the smell of a sulfide is added to the gas. This pungent smell can serve as a warning. (Taken from the Internet)

At 2 o'clock in the afternoon, a gas poisoning incident occurred in Room 101, Building 5, Yuyang Community, East District, A City, the scene of the crime was a construction area of 60 ordinary meters, and there was a female deceased lying on the sofa in the living room, 30 years old, 152cm tall, weighing 101 pounds, married, having a daughter, housewife.

AUTOPSY REPORT: THERE WERE NO EXTERNAL INJURIES ON THE BODY, THE SKIN AND MUCOUS MEMBRANES WERE CHERRY RED, THE BLOOD ALCOHOL CONTENT WAS 180MG/ML , THE BLOOD HBCO CONTENT CONCENTRATION OF THE DECEASED WAS 57%, THERE WAS WHITE FOAM IN THE MOUTH, AND NO TOXIC SUBSTANCES OR HYPNOTIC SUBSTANCES WERE FOUND IN THE STOMACH OF THE DECEASED.

On-site report: no traces of theft, no traces of rummaging, no cash lost, half a bottle of Wuliangye that was not drunk on the coffee table in front of the sofa, a cup, and only the fingerprints of the deceased on the cup and wine bottle.

Liu Donghe suspects that the case is suspicious, after investigation, the female deceased bought a large amount of insurance for herself in front of her with a total value of 10 million, the beneficiary is her husband, these insurances only took effect the day before yesterday, the deceased's family is in good condition, all kinds of deposits, investments and cash totaling more than 70 yuan, no foreign debts, the deceased often played mahjong with the neighbor's eldest sister before his death, generally can play 4 days a week, but the neighbors think that this person's brand is not good, but the deceased sometimes goes to the neighbor's house in the afternoon to sit in the afternoon until he plays mahjong, The soundproofing of this place is not good, if you talk loudly, you can hear it next door.

Liu Donghe confessed for the first time to the following people:

1. The deceased's husband (also the informant): The deceased generally did not drink, had a nap habit, generally around 1 to 3 o'clock in the afternoon, basically did not change much, he left the house at 8 o'clock in the morning, went home at 2 o'clock in the afternoon to pick up things, after entering the house, found that there was a strong smell of gas in the house, the wife lay on the sofa and did not respond, and the kitchen gas was still boiling water but the water was dry, so open the window first and then call the police. They have a good relationship between husband and wife, never quarrel, and have heard the deceased say that he has thoughts of suicide.

2. Neighbor Xiaofu (one of the people who often played mahjong with the deceased): I didn't hear the sound of the deceased's house opening and closing the door before, but Liu Donghe found that this Xiaofu was actually a little excited about the deceased's death, and kept his mouth shut about the relationship between the deceased and the deceased's husband

3, neighbor Wang sister-in-law (one of the people who often play mahjong with the deceased): the deceased has a bad character, and is very lazy, sometimes the deceased's husband comes back, the meal is not ready, the daughter has not been picked up, the deceased and her husband quarreled a lot for this matter, she was shopping outside before and after the incident (there are witnesses), there is a male classmate who heard that the deceased often came to visit the door when the deceased's husband was not at home, basically as long as the deceased did not play mahjong, this male classmate came, and generally left from 1 to 3 o'clock in the afternoon, I have never heard the deceased say that he had thoughts of suicide

4. The deceased's undergraduate college classmates: I don't see each other much, this classmate has to go to work from Monday to Friday, and the deceased sees the child from Saturday to Sunday. So the time is not right, but they have a fixed day, the class reunion is the last day of each month, the deceased drank a lot of alcohol and could almost drink a bottle of liquor, and the deceased had an ambiguous relationship with a male classmate and often went out alone. (She was at work at the time of the crime, but no one could prove it.) I didn't hear the deceased say that he had thoughts of suicide, but I heard the deceased say that he wanted to divorce her husband because her husband went back to quarrel with her when he was in a bad mood, and would have divorced long ago if it weren't for the sake of the children.

5. The deceased's classmates (people who had an ambiguous relationship with the deceased): The deceased was very good at drinking, and did have an ambiguous relationship with the deceased, but he was not out of line, just talking to him as a good friend. The relationship between him and her husband is not very good, I have heard that the deceased has the idea of divorce, I have not heard that the deceased has the idea of suicide, I went to the deceased's house at 9:30 a.m. that day, chatted with the deceased and left, the deceased was still fine when he left, but he was already gone at 11 o'clock at noon (the community security guard can testify).

6. Community security: The deceased's family has not been to strangers, except for the deceased's classmates, who went to the deceased's house at half past 9 o'clock and left at about 11 o'clock at noon, the deceased's husband also returned home at 9 o'clock in the morning and stayed for 10 minutes before leaving. The deceased had a bad temper and was the kind of person who used people to face forward instead of people to face back, so he basically didn't know about the situation in her family. -

If this is a murder, how should Liu Donghe find out from whom? Who is most likely to be the murderer? There are two people here who are the most suspicious, and Liu Donghe has decided that one person is lying.

The answer will be revealed later, and the story continues in the second chapter,