How did the police intelligently solve the murderer's "not present" murder case?

When Lemou from the same village got home, he found that his home was full of pungent smell of blood and he was lying motionless in a pool of blood. After receiving the alarm, Taoyuan County Public Security Bureau quickly launched the murder detection mechanism. Lei Tianxi, deputy director, led a number of public security departments such as criminal investigation, criminal technology, intelligence, network supervision and Xunyang police station to set up a "2.02" task force and immediately launched an investigation. The police comprehensively judged the operation and activity track of Wu Mou's mobile phone and household appliances before his death, and concluded that Wu Mou should have been killed on the night of 65438+1October 28th. Therefore, while visiting and arranging Wu Mou's relations, the police conducted an investigation near the time node on the evening of June 28, 65438/KLOC-0. By visiting and contacting the platoon, the police learned that Wu Mou was quite lonely. He seldom associates with people, and he hasn't had a big conflict with people recently. However, some people say that his wife Zhu is getting a divorce recently.

Zhu was widowed before and remarried on 20 18. Recently, the two divorced because of economic disputes and trivial matters, and they often quarreled. By questioning Zhu, the police found the cause of Zhu's death, which he didn't seem to know. Many people confirmed that Zhu was not present on the day of the incident. As far as body shape is concerned, Zhu himself could not have caused such a fatal injury. Is Zhu helpful? Through further investigation of Zhu related people, no one is willing to kill for Zhu, and if there is, there is only one-Zhu's son Zhang. The police quickly investigated Zhang, only to find that Zhang was not at the crime scene on the day of the crime. Zhang's playmates said that Zhang had been playing cards with them until the afternoon 12 on the night of the incident. If it wasn't Zhu or Zhang, who would it be? Killing with passion? It seems impossible to commit crimes in other people's homes. Psychopaths kill people? Can't be completely ruled out.

The case suddenly reached a deadlock. There seems to be a fog waiting for the project police to break through, but there is no clear direction. At this time, the video investigation police found a suspicious clue in the massive video surveillance: at 7 o'clock on the evening of the 28 th, a man appeared around the crime scene. The man doesn't take the usual path, and seems to be avoiding surveillance. His route successfully escaped most of the surveillance, but it was captured by several surveillance cameras under the exploration of the ubiquitous "goods-knowing project". The police tracked the man through video and found that he appeared on the monitoring screen at 7 o'clock, took a taxi to Zheng Jiayi at 8 o'clock, and changed his clothes twice on the way. This man is very suspicious. The police extracted the physical characteristics of the man and confirmed that the man was Zhang after repeated comparisons. Isn't he playing cards? The police immediately summoned Zhang, but Zhang was no longer at home. After careful research, the police locked Zhang in Fujian, and then with the strong support of the Provincial Public Security Department and the Fujian police, they rushed to Quanzhou, Fujian Province overnight to control Zhang.

In the face of the hard evidence recorded by video surveillance, Zhang left and right hands, and finally lost a whole line and truthfully confessed his criminal facts. It turned out that because of the contradiction between his stepfather and his mother, Zhang held a grudge for a long time and thought that only by getting rid of it could his mother live in peace, so he began an evil plan. Zhang learned some anti-reconnaissance knowledge through Baidu search. Then, he conducted a field survey around the crime scene in advance, checked the scope of the surveillance video, and worked out a targeted sneak escape route. In order to create an alibi, he thought of the teahouse downstairs in his hometown. On the afternoon of October 28th, 65438/kloc-0, he drove back to his hometown alone, played in the teahouse downstairs and had dinner. After dinner, he deliberately asked others to go upstairs to rest, and then came down to play cards. Then I went upstairs in front of everyone, but I quietly came out and rented a car and went straight to Taoyuan County. According to the pre-planned route, Zhang changed into the costume of the crime, sneaked into the house, killed it with a knife, and then changed back to the original costume. Finally, he took a taxi back to his hometown and played cards with friends until the early hours of the morning. Zhang believes that the perfect plan did bring some trouble to Taoyuan police, but it was just trouble. As the saying goes, skynet is long, but it is not leaking. Faced with more and more advanced criminal investigation methods, Zhang Can couldn't hide from the beginning. At present, Zhang has been arrested in accordance with the law and is waiting for severe punishment by the law.