It has been three years since YINGYING ZHANG was killed. During this period, her family suffered great pain. The FBI has long identified the suspect as Christensen. He is a teaching assistant in a university. His job is physics and he is very interested in science. Therefore, after he killed YINGYING ZHANG, it is very likely that YINGYING ZHANG's body will be destroyed by a relatively secret means. There are several possible ways to deal with hiding.
The first possibility is to dismember YINGYING ZHANG after his family killed him, dissolve the body with some chemicals, and then discharge the remains of the body to the outside through the sewer. This will make this person disappear unnoticed, so the police should focus on the sewer pipe in the suspect's home to see if there is any residual human tissue.
The second possibility is that he may hide YINGYING ZHANG's body in his laboratory. Because Christensen is a physics assistant in a university, he has his own laboratory in the university, and there will be relevant places in the laboratory to hide the body well. Only he knows these places, and no one else knows them, so we should search his laboratory.
Now Christensen has been sentenced to life imprisonment by an American court, which is the highest punishment in the United States. But YINGYING ZHANG's body has never been found. I hope that the local police in the United States can work harder so that YINGYING ZHANG can be found as soon as possible and her soul can return to her hometown as soon as possible.