120 sent a father and son who were injured in a car accident to the hospital, and the injuries were very serious. After some rescue by doctors, the father and son died one after another.

The nurse recorded the son's death at 23:59 and the father's death at 24:59, just one minute apart, and the doctor signed the resuscitation record.

But within a few days, the police received a call that a man had died in the hotel. After the forensic examination of the body, the preliminary judgment was that the deceased died of poisoning.

The police found the keys to a car on the bed, and according to the waiter's recollection, the male guest came to the hotel alone at about ten o'clock yesterday.

It didn't take long for a woman in a red coat and sunglasses to come to him.

The police quickly found out the identity of the deceased, who was a doctor named Zheng Haifeng in the emergency department of the Third Hospital.

Later, Lao Ji inspected the car driven by the deceased, and looking at the vehicle driven by the deceased, the police said that the current doctor is really rich.

Lao Ji found several red envelopes in the glove box, and there was some cash in the red envelopes.

Through the autopsy, the medical examiner found that the deceased's blood was cherry red, the scene of the crime and the deceased's mouth had the taste of bitter almonds, and the body was also pink. From these phenomena, it can be shown that the deceased died of potassium L-poisoning, and the time of death was between 9 and 10 o'clock last night.

The police drew a mock portrait of the woman in red through the waiter's description of her. The deceased's wife, Xu Na, came to the criminal police team to identify the body, but she did not seem to be sad.

Xu Na provided some clues to Lao Ji, and she took out a letter from her bag, which said that Zheng Haifeng had an improper relationship with Yu Xiaoyan, a female nurse at their hospital.

Xu Na said that she received the letter a month ago, and that the letter was dropped directly into her home's mailbox.

When Lao Ji asked where she was from eight to eleven o'clock last night, Xu Na did not shy away from saying: She was with her boyfriend Dashan.

Lao Ji found Dashan, who is a lawyer who is helping Xu Na deal with matters related to her divorce from Zheng Haifeng. He took out the divorce agreement signed by the two before, and because the man had a third party involved, the object was Yu Xiaoyan, a female nurse in their hospital. So Zheng Haifeng not only has to compensate Xu Na 500,000, but the house they live in is also owned by Xu Na.

Lao Ji came to Yu Xiaoyan's house to understand the situation, and at the door, the police found that the door was hidden. Lao Ji took out his gloves so as not to destroy the fingerprints left on the doorknob.

When he pushed open the door, he saw Yu Xiaoyan lying on the sofa, and there was a red coat on the bed.

Lao Ji took a closer look and saw that Yu Xiaoyan was dead, so he hurriedly asked the police to notify the forensic doctor. At this time, an aunt downstairs was walking her dog on the lawn, and the puppy was biting the bottle in the lawn to play, but it didn't take long for the puppy to bark a few times and died.

After inspecting the scene, the police brought Yu Xiaoyan's body back to the police force, and the police speculated that Zheng Haifeng and Yu Xiaoyan had an extramarital affair, and then Xu Na was told, and Xu Na filed for divorce.

Zheng Haifeng also agreed to the divorce, but after the divorce, Zheng Haifeng never thought about marrying Yu Xiaoyan at all, so Yu Xiaoyan held a grudge and poisoned Zheng Haifeng first, and then committed suicide by taking poison.

But Xiao He said that judging from the situation at the scene of the crime, Yu Xiaoyan did not look like he committed suicide at all, and Lao Ji ordered the police to contact Yu Xiaoyan's sister immediately.

Through an autopsy, the forensic doctor found that Yu Xiaoyan also died of potassium L-poisoning, and the time of death was around 1 pm.

The police also tested the composition of potassium L in the teacup at the scene, and Yu Xiaoyan's fingerprints were left on the teacup and teapot handle.

The scene was swept away, and no traces of other people were found, and the police also found that the bottle that poisoned the dog contained potassium L. The police collected a fingerprint on the bottle, and after comparison, the fingerprint did not belong to the deceased Yu Xiaoyan.

Yu Xiaoyan's sister Da Mei came to the police station, and her sister died, and Da Mei was very sad. Da Mei said that the last time she saw her sister was a week ago, her wallet was stolen on the bus, her bank card was lost, and it took a week to withdraw the money, and she caught up with her husband on a business trip.

She was going to ask her sister to borrow 2,000 yuan, Yu Xiaoyan opened the wardrobe, took out 2,000 yuan from an envelope and lent it to her. She also asked Yu Xiaoyan where she got so much money, it was too unsafe to put at home.

Yu Xiaoyan said that these were red envelopes given by the patient's family, and she hadn't had time to save them yet. Lao Ji took out the red envelope he found in Zheng Haifeng's car and asked Da Mei if it was like this, and Da Mei said that Yu Xiaoyan's red envelope was a white envelope with the words 20,000 written on it in pencil.

When asked if she knew the relationship between Yu Xiaoyan and Zheng Haifeng, Da Mei said that her sister was actually quite simple, and she didn't know how she got along with Zheng Haifeng, and her sister didn't dare to tell her that their relationship was bumped into by her once.

A few days ago, his sister called him and said that Zheng Haifeng had agreed to divorce his wife. Regarding her sister's death, Da Mei believes that she will never commit suicide.

Just when Lao Ji was thinking about the case, Xiao He reported: The handwriting of the letter Xu Na received was the same as the duty registration form sent by the hospital, and this person was nurse Hao Hongmei.