On Valentine's Day, the man drove into a little girl selling roses, he stopped the car and bought two with the little girl, and then a murder happened. A man falls off a high bridge, resulting in his death.

Lao Ji rushed to the scene with people, the deceased was a man, and the forensic examination found that the body did not have much blood, there was no trace of spraying, and it did not look serious on the surface.

The deceased's eyelids were congested and there were mild ulcers on the N membrane of the mouth, which seemed to be a symptom of poisoning, and the specific situation could not be determined until after examination.

At this time, the mobile phone in the deceased's shirt rang, Lao Ji took out his mobile phone, answered the call, and Lao Ji inquired and learned that the caller was called Liu Mei.

Liu Mei, accompanied by her younger brother Liu Song, came to the Public Security Bureau, Liu Mei was too sad, and Liu Song briefed the police on the situation.

It turned out that the deceased was Liu Mei's husband, named Zhu Fengfan, who was 56 years old this year, and Liu Mei was only 26 years old.

Liu Song said that Zhu Fengfan was the owner of a chemical factory, that Liu Mei used to be the cashier of the chemical factory and that he had not worked since she got married, and that he himself was a freelancer who usually did some work at home designing web pages and maintaining websites.

He said that on the night of the crime, Zhu Fengfan came back by train at 9:40, and he arrived at the train station at 9:30, but he never waited for Zhu Fengfan, thinking that Zhu Fengfan had taken a taxi home.

But the police found out from the deceased's mobile phone that Liu Song had called the deceased at half past nine. Liu Song said that they had made an appointment to meet at the exit of the station, and Liu Mei recalled that Zhu Fengfan only took a white-box lockbox when he left. In addition to some clothes, there were cash and checks.

According to the bleeding condition of the deceased's wounds, the medical examiner showed that Zhu Fengfan had died before he fell from the bridge. The deceased's pelvis was shattered, which is also supposed to have been caused by a fall from the bridge after death,

According to Lao Ji's analysis, this should have been thrown by someone, and the forensic doctor also determined through the gastric juice test of the deceased that the deceased drank a drink mixed with potassium Q before his death, and the cause of death was potassium poisoning.

There were no signs of binding or coercion on the deceased's body.

Lao Ji analyzed that the person who could make him drink the drink should be his acquaintance.

Sister Xi found out that on the night of the crime, a woman who claimed to be named Yueyue sent text messages to Zhu Fengfan many times to ask him to meet. Lao Ji asked her to find out the details of this woman.

and asked Xiao He and Ah Qiang to inspect the car that Liu Song had driven, and he told Xiao He that Zhu Fengfan was poisoned and dumped his body.

Xiao He took the seat cover of Liu Song's car back for inspection.

Sister Xi found out that Yueyue's mobile phone number was purchased a month ago, and she did not do real-name registration, and it has been turned off, and the technical department has monitored this number.

Xiao He found no suspicious traces in the car that Liu Song drove. After investigating Zhu Fengfan's social relations, Ah Qiang found that Liu Mei was Zhu Fengfan's second wife, and his ex-wife died of illness two years ago.

The two have a son and a daughter, Liu Mei was divorced twice before marrying Zhu Fengfan, and she was divorced twice at the age of 26, which surprised Xiao He.

It is said that every divorce is caused by the man's emotional infidelity, and her last marriage lasted less than three months.

Liu Mei is more sensitive to feelings, and the failure of her marriage made her disheartened, she once vowed not to marry again, and finally married Zhu Fengfan because her mother needed a lot of money for kidney replacement surgery.

Zhu Fengfan sponsored the money on the condition of marriage, so the marriage of the two is just an exchange of contractual relationships.

It was only less than half a year after the marriage, Zhu Fengfan was killed, Zhu Fengfan is usually very good to Liu Mei, but it is said that before the case, they were in the Cold War period, and the cause was the ambiguous text message sent to Zhu Fengfan by Yueyue.

Ah Qiang also found out that on the night of the crime, Yueyue sent a text message to Zhu Fengfan half an hour after Zhu Fengfan's death, which shows that Yueyue did not know that Zhu Fengfan had been killed.

Lao Ji said that this may be a deliberately created illusion, and Liu Mei's ex-boyfriend is named Zhang Ji. Lao Ji asked Ah Qiang to investigate this person and see if Liu Mei still had a relationship between the two after marriage.

The reason why he investigated was that Lao Ji found that this Zhang Ji's profession was the manager of the chemical laboratory of the University of Technology, and he had the opportunity to come into contact with potassium Q.

The police's suspicion of Zhang Ji made Liu Mei call it impossible, she said that Zhang Ji was not so bad and so vicious. She said that the relationship between the two of them was not bad, but because her mother was seriously ill and urgently needed a large amount of money for surgery, Zhang Ji couldn't help her, and in the end it was Zhu Fengfan who helped her.

She also mentioned that the last contact between her and Zhang Ji was on the night of Zhu Fengfan's murder, when Zhang Ji called her, talking nonsense, as if she was drunk, saying that he saw Zhu Fengfan and a woman buying roses together.

Ah Qiang found out at the school guard that Zhang Ji had returned to school in the early hours of the morning, covered in alcohol.

Lao Ji analyzed that Zhang Ji called Liu Mei at more than ten o'clock, and the blank time until the early hours of the morning coincided with Zhu Fengfan's death, so he had enough time to commit the crime.

Ah Qiang guessed that the woman who bought roses with Zhu Fengfan was likely to be Yueyue, and Zhang Ji saw his girlfriend's husband spending money outside, it was very likely that he was impulsive after drinking and stalked and killed Zhu Fengfan.

Lao Ji asked Ah Qiang to go to Zhang Ji's laboratory to investigate and see if there was any loss of potassium Q, and he found Zhang Ji again, Zhang Ji said that on the night of Valentine's Day, he was drinking alone in the restaurant opposite the school.

He denied seeing Zhu Fengfan that night, but when Lao Ji questioned him why he told Liu Mei that he saw Zhu Fengfan buying flowers with a woman that night, he claimed that he was drunk that night and didn't remember saying this.

At this time, Ah Qiang called and said: Zhang Ji's laboratory has lost half a bottle of potassium Q.