the truth of p>crimaster's deadly flame
introduction to the case of "deadly flame":
at 19: 35 on January 8, 221, the Shanghai police received a report from a security guard in a science park, claiming that all employees of a research institute in the science park died in the laboratory. The police immediately went to and blocked the scene; After investigation, the police have locked four suspects. Due to the bad nature of this case, the police now choose to make the clues public, hoping that global detectives will assist in the investigation.
The deceased in Fatal Flames:
Lu Yiran
The suspects in Fatal Flames:
Wang Jiaming, Bai Qiuyuan, Wu Xinchen and Zhu Lingfang
The answer to Fatal Flames:
Zhu Lingfang
The truth analysis of Fatal Flames:
It was confirmed that the hair in the fume hood matched the victim's DNA. The police immediately matched the fiber on Zhu Lingfang's window frame with the material of Zhu Lingfang's work clothes; Conduct an in-depth investigation on the spot. According to the online consumption records and delivery records of logistics companies, Zhu Lingfang recently bought alcohol lamps, rubber gloves, isoflurane and hemp rope online. At the same time, the trace laboratory staff found a lipstick in the grass near the path of the bamboo forest in the research park and entered it into the physical evidence room. Under the police interrogation, Zhu Lingfang finally admitted the facts of the crime.
the breakthrough point of the case: using identity dress as an alibi; Motive.
1. Cause of death: According to the autopsy report, there were multiple fractures of the neck, punctate hemorrhage of the conjunctiva of the eyes, small bleeding in the interlobular fissure of both lungs, lifeless surface rupture and no carbon powder in the stomach, it can be judged that the deceased was burned after mechanical asphyxiation.
2. Time of corpse burning: According to the monitoring clues of the Institute, it can be concluded that when Wang Jiaming left, Lu Yiran and Wu Xinchen both stayed in Building 11; After Wang Jiaming entered and left for the second time, Wu Xinchen remained in Building 11 when Zhu Lingfang cleaned and left; After Wu Xinchen left, Bai Qiuyuan and Lu Yiran entered the 11th floor. According to the monitoring and confession, Bai Qiuyuan was on the scene when Wu Xinchen left.
3. Relationship of corpse burning: According to the clues and social relationships of suspects, the possibility that Wang and Zhu jointly commit crimes or the others cooperate with cleaning Zhu Lingfang can be ruled out.
According to the time when Wu and Bai met at the door and the body was found, Wu Xinchen was suspected of burning the body.
Wang+Wu: According to the clue, Wu Xinchen is interested in Wang Jiaming, but Wang Jiaming is not interested in Wu Xinchen. However, according to Wu Xinchen's clue, Wu Xinchen stole new drugs and contacted headhunters, which can rule out the possibility of two people joining together.
Bai+Wu: Bai Qiuyuan and Wu Xinchen have no relevant interests, only that they know each other. At the same time, Bai Qiuyuan, as a paranoid personality, is difficult to cooperate with others to kill. According to the monitoring clues, Bai Qiuyuan arrived later. If he was an accomplice, it should be Wu Xinchen's murder. According to the clues, Bai Qiuyuan had a heart for the dead, and he also implemented a plan of potassium cyanide at the mouth of the cup. In this case, if he committed a crime for two people, it should be a premeditated crime. Bai Qiuyuan did not need to decorate potassium cyanide. According to his chat records, Bai Qiuyuan did not know Lu Yiran's itinerary. According to the wedding ring, roses and chat records, it can be confirmed that Bai Qiu originally planned to propose to Lu Yiran today, that is, it was not premeditated murder, so it can reduce the possibility of her burning the body as an accomplice.
Bai+Wang: They have no relevant interests. And there is no possibility of hiring a murderer.
Crime scene:
1. According to the surrounding environment of the crime scene, it can be determined that there are a large number of monitoring blind spots outside the research institute in the park. The window of the crime scene can only be opened from the inside, which directly excludes the possibility that the murderer bypasses the monitoring from the outside and enters the research institute through the window;
2. It can be inferred that the murderer left the laboratory through the window and closed the window from the outside by combining the clothing fiber on the window frame and the state that the window was closed but not locked;
3. Nothing was lost in the laboratory. The murderer brought his own things as combustion-supporting materials.
According to the above information, combing the clues of the suspects again can draw the following conclusions:
1. Bai Qiuyuan: The edge of the water cup of the deceased at the scene was detected with potassium cyanide, but the inside of the water cup was dry and fingerless, indicating that the water cup was not used for drinking for a short time. According to the monitoring clues, if he died of poisoning, it should be when Lu Yiran entered after Bai Qiuyuan entered. If so, Bai has no chance to burn the body. Through the above summary, there is no possibility of cooperation in burning the body. Combined with the contents of the autopsy report of the deceased, it can be judged that the deceased did not drink the poison, but died of mechanical suffocation caused by strangulation or strangulation. Because potassium cyanide is a white spherical lump, granular or crystalline powder in normal state, it can be concluded that Bai Qiuyuan was originally a poisoner corresponding to the unmarked white powder in Bai Qiuyuan's home. Therefore, Bai Qiuyuan's attempted murder can be obtained.
According to the suspect's chat record, the deceased cheated Bai Qiuyuan again by going to his best friend's house and other reasons, but in fact he met a friend of the opposite sex. The special date, the ring box at home and the scattered rose petals all point to Bai Qiuyuan's intention to propose on the same day, so Bai Qiuyuan has a motive to kill. However, according to the chat record schedule, it is clear that Qiuyuan received the information at 18:17 that night, and combined with his behavior of not destroying the poisons at home, it can be inferred that Bai Qiuyuan was a passionate murderer; The scene shows that the deceased was burned by fire after being killed, and the murderer used monitoring and burning methods to eliminate a large number of traces of crime, which is a manifestation of premeditated murder. At the same time, if Bai Qiuyuan strangled the deceased with a ribbon, he could completely destroy the ribbon instead of taking it home to increase his suspicion, so he ruled out the possibility of Bai Qiuyuan committing a crime.
2. Wang Jiaming: According to my colleague's confession, Wang Jiaming had an argument with the deceased that afternoon; Chat records show that Wang Jiaming has something in the hands of the deceased. According to the description of the deceased in the chat record, the secret is likely to lead to the closure of the institute; On the other hand, according to clues, Wang Jiaming is in urgent need of money because his family is ill. Therefore, it can be conjectured that Wang Jiaming killed the deceased in order to keep the institute and maintain the economic source of treating his family.
Wang Jiaming's suspected crime is that inhaled sevoflurane in his personal belongings is an anesthetic, and he returned to the scene to look for the strange behavior of the deceased and the words in his diary. However, according to the oral clues, it is an important juncture for the development of the institute to study all new cooperation projects recently; He can achieve his goal by making the deceased shut up forever, but there is no reason to choose to attack the deceased or even burn the body in his own research institute, which will lead to the damage of his research institute's interests and conflict with his motives, and there will be a second person at the time when he can burn the body at the scene. Therefore, Wang Jiaming's suspicion declined.
3. Wu Xinchen: It is recognized that the man in Wu Xinchen's home painting is Wang Jiaming. Combining with the lyrics behind the painting, it can be inferred that Wu Xinchen is interested in Wang Jiaming. Wu Xinchen's chat record with the deceased and Wu Xinchen's own confession all show that Wu Xinchen has strong dissatisfaction with the deceased. And Wu Xinchen's chat record with headhunters and ldquo described by cleaners; Swinging around rdquo; Suspicious behavior increased Wu Xinchen's criminal suspicion. However, according to the time, Wu Xinchen did not have the possibility of burning the body before Bai Qiuyuan arrived after cleaning left, so Wu Xinchen was initially ruled out.
According to the new drugs lost in the refrigerator and the ice cubes in Wu Xinchen's thermos, it is inferred that Wu Xinchen stole the new drugs on the day of the murder and temporarily stored them in the thermos and ice cubes.
3. Possibility of delay device: There are two possibilities for a small amount of glass fragments beside the body: the murderer entered the scene and left this trace or left this trace through the delay device.
Assuming that the murderer committed the crime through a time delay device, it can be concluded that Wang Jiaming, Zhu Lingfang and Wu Xinchen did not have the reason to set up a time delay device when they learned that the second person was present, otherwise they would probably be discovered by others. However, Bai Qiu's principle didn't produce the murder until the information was received at 18: 17 that night, so there was not enough time to prepare the delay device, so the possibility of using the delay device was ruled out.
according to the monitoring records, after excluding the possibility of multi-person committing crimes and delay devices, we can get the ldquo that finally entered the monitoring; Lu Yiran rdquo; Not the victim himself. According to the clues of height and weight, only Wu Xinchen and Zhu Lingfang are consistent in the height of the deceased, and it is difficult to confirm the body shape in winter because of bloated clothes.
According to the monitoring records and autopsy reports, there are three kinds of conjectures about the time of death, namely, the first one is that the deceased who appeared in the monitoring twice were real, the second one was true for the first time, the second one was false, and the third one was false for both times.
the first type: according to the postmortem cremation, there is no delay device, which can be directly ruled out.
the third type: if it is false twice, it is not necessary to go in again after coming out to repeat the crime, which can only increase the suspect's suspicion, but can not get rid of it, so it can be ruled out.
that is, there is only the second possibility.
At the same time, suppose that Wu Xinchen entered the scene pretending to be the deceased at 19: 5, only 25 minutes before the security guard heard the smoke alarm enter the scene. Even if there is a lighter in Wu Xinchen's belongings, she still needs a lot of combustion-supporting articles to destroy the crime tools and the bodies of the deceased in a limited time. According to the on-site clues, the laboratory did not lose any other items, and Wu Xinchen himself did not carry any combustion-supporting items to help rule out Wu Xinchen's clues.
4. After excluding other suspects, we can lock the murderer in this case as the cleaner Zhu Lingfang. According to the conclusion that the murderer returned to the scene disguised as the dead, the murderer must have two sets of his own clothes and leave one set on the scene for backup; At the same time, the appearance characteristics of the murderer should be as close as possible to the deceased. According to the police investigation clues, Zhu Lingfang has two sets of work clothes in her workshop; At the same time, the neighbor's confession mentioned that Zhu Lingfang had abnormally permed her hair, both of which pointed to Zhu Lingfang's possibility of satisfying the identity change. Zhu Lingfang's workshop has sterilized alcohol as a combustion-supporting material, and there are matches in her work clothes to burn the body.
From the point of view of murder motive, although Zhu Lingfang claimed that she had no deep hatred with the deceased, comparing the time when the deceased arrived at the institute in Wu Xinchen's chat record with the time when Zhu Lingfang confessed to working as a cleaner in the park, it can be concluded that the two times are basically consistent. The testimonials of Zhu Lingfang's daughter from home to junior high school can be inferred that her daughter studied in junior high school before her death, and the deceased was dismissed as an experimental teacher in junior high school in her resume. Therefore, it can be assumed that the deceased had contact with Zhu Lingfang's daughter while serving as a junior high school teacher and thus became Zhu Lingfang's motive for killing. According to the habit of the deceased who likes to bask in life in the circle of friends and the time when Zhu Lingfang applied for a cleaner, we can further determine the possibility that Zhu Lingfang deliberately sought revenge for the deceased because of her daughter.
According to the trace analysis at the scene, a large amount of carbon ash around the corpse is extremely abnormal, so it can be inferred that unknown objects were burned together with the corpse. At the same time, the strange dust wipe marks in the cupboard under the fume hood combined with the hair left in the cupboard can be inferred that the marks there are most likely left by the murderer in the process of hiding and moving the body.
Case restoration:
Bai Qiuyuan and Lu Yiran have known each other since college, and they often hang photos of Lu Yiran at home to record the little things between them. By chance, Bai Qiuyuan sent an umbrella to Lu Yiran, who went to his girlfriend's house, only to find that Lu Yiran was not at his girlfriend's house at all, but went to see other friends of the opposite sex. After that, the two have been arguing repeatedly because of this matter.
On the day of the crime, when Bai Qiuyuan found himself betrayed again, the accumulated torture made him lose his mind in an instant. After writing down his angry words in his diary and tearing up his lover's photos, he has been engaged in the chemical industry and found out the potassium cyanide stored in his home. He entered Lu Yiran's office and secretly painted it on her cup, so that when Lu Yiran came back to drink water, he would be poisoned to death. But Bai Qiuyuan, who has finished everything, still feels like a knife when he returns home. So he took out sleeping pills and wine and planned to paralyze himself forever. Wu Xinchen came to the institute for many years, but Lu Yiran, who was incompetent, didn't appear long before she became her boss, and she often blamed her for problems. Not only that, the frequent contacts between Lu Yiran and Wang Jiaming made Wu Xinchen start to suspect that they had proper relationship. All along, the dedication, support and feelings have been betrayed in the morning and evening, and Wu Xinchen hates them very much; She angrily tore up her beloved paintings and photos of Lu Yiran, and decided to return with betrayal.
the headhunter's message is a recruiter from another research institute; Wu Xinchen used the latest pharmacy and core technology of the Institute as an exchange to apply for the technical researcher of the other side, just to get back at the Institute. On the day of the incident, Wu Xinchen has been observing the situation around the institute, waiting for colleagues and cleaners to leave and enter the laboratory to steal the latest drugs and store them in thermos cups, and hurriedly left to meet with the staff of the new institute.
Wang Jiaming has achieved excellent results since he was a child, so he demands perfection for himself and has always been praised by others. After graduation, he started his business with enthusiasm but failed all the time; Coincidentally, he stole a student's research results and settled the students with money, but he put the institute on the right track with this patent. Who knows that Lu Yiran, who later joined the company, has mastered the evidence of his mistakes in the past and used this condition to ask Wang Jiaming to give himself a promotion. But in the past year, Lu Yiran's performance was completely incompetent as a formal researcher. Wang Jiaming repeatedly discussed with Lu Yiran in the office but was threatened again and again.
On the afternoon of the crime, Wang Jiaming had a quarrel with Lu Yiran, but he accidentally learned the whereabouts of the evidence from Lu Yiran. He quickly formed a plan in his mind, so he softened his attitude and proposed to meet Lu Yiran at the institute at 18:15 to go out for an interview. After returning home, he prepared inhalation anesthetic and handkerchief to return to the institute, and then planned to take Lu Yiran out of the institute. At that time, he planned to forcibly cover Lu Yiran's nose with a handkerchief sprayed with anesthetic to make him unconscious, and then found evidence to destroy after Lu Yiran lost consciousness. However, when Wang Jiaming arrived at the crime scene on time, he was told by Wu Xinchen that Lu Yiran had left. He looked around but found no trace of Lu Yiran. At the same time, because he couldn't open Liu Yiran's cabinet without a key, he had to leave angrily.
Zhu Lingfang was abandoned by her husband in her early years, so she devoted all her love and hard work to her daughter. However, as luck would have it, Zhu Lingfang's daughter suffered a laboratory accident when she was in junior high school. The cause of the accident was that her daughter and classmates accidentally touched the alcohol lamp in the experiment, which caused Zhu Lingfang's daughter to suffer severe burns on her thighs and abdomen. At the time of the accident, the teacher who taught the experiment class panicked himself. Not only did he fail to deal with the accident in time, but he also gave wrong guidance to make the burn worse. Zhu Lingfang has been trying every means to get justice for her daughter after learning the truth from her daughter's mouth, but it has no result; The daughter committed suicide by jumping off a building because of severe burns and mental breakdown.
Under the great blow, Zhu Lingfang became paranoid and crazy; She blamed all the faults on the teacher mdash; mdash; Lu Yiran. Lu Yiran, who lived in a circle of friends without remorse, even stimulated her, so she began a year-long revenge plan.
A year ago, Zhu Lingfang successfully applied for the post of cleaner, and carefully used her professional advantages to observe the institute and its surrounding environment. During her tenure, Zhu Lingfang tried to control her emotions, but she still quarreled with the deceased because of trivial matters. Three days before the incident, Zhu Lingfang bought alcohol lamps and isoflurane purchased through illegal channels online, and made something similar to the deceased.