Attempted crime means that a crime has been committed and fails due to reasons other than the will of the criminal; the discontinuance of a crime refers to the preparation for the crime, the execution of the crime and the occurrence of the result of the crime after the end of the crime, automatically discontinue the crime or automatically and effectively prevent the occurrence of the results of the crime out of one's own will.
According to the above definition, which of the following belongs to the discontinuance of a crime?
Sun had a dispute with Zhao, a classmate in the dormitory. One day, when Zhao was in class, Sun left the dormitory after dropping highly toxic cyanide in the drinking fountain, trying to poison Zhao to death. On that day, a law promotion activity was being held on campus, listen to After the legal preaching, Sun quickly ran back to the dormitory to dump the water. Unexpectedly, Zhao returned to the dormitory early because of physical discomfort that day, and when Sun arrived at the dormitory, he found that Zhao had been poisoned and died