On June 30, the FBI arrested Christensen and charged him with kidnapping under . According to the law, if a kidnapping results in the death of any person,
life imprisonment or the
death penalty is prescribed. The FBI report noted that in April, before the alleged kidnapping, Christensen used his cellphone to access the sexual fetish website
Fetlife, visiting forums such as "Abduction 101". Christensen had no prior criminal record and no record of disciplinary problems at the university.
Assistant U.S. Attorney Bryan Freres said that there was no "combination of conditions" where Christensen was not a danger to the community. Freres revealed more details from the investigation not presented in the criminal complaint. He told the court that Christensen had attended a vigil held for Zhang on June 29, where he had described "the characteristics of his ideal victim", and had pointed out those in the crowd who matched them. Additionally, Christensen was recorded saying that Zhang had resisted and fought with him, and he was also recorded threatening someone who then provided incriminating evidence to authorities. Christensen pled not guilty at his
arraignment on July 20, 2017. Christensen's trial began in June 2019 with his attorney, George Taseff, admitting in the opening statements that Christensen killed Zhang and he was on "trial for his life" because he could face the death penalty. During sentencing deliberations, the jury could not unanimously agree to sentence Christensen to death. As a result, he was sentenced to life in prison without the possibility of parole on July 18, 2019. Following the trial, prosecutors revealed information about Zhang's remains that Christensen divulged through his attorneys in November 2018 under an immunity agreement. The day after he killed Zhang, Christensen claimed he put Zhang's dismembered body in three separate garbage bags which he then disposed of in the dumpster outside of his apartment. Over the next two days, Christensen claimed he disposed of Zhang's personal belongings in various dumpsters in the Champaign-Urbana area. The dumpster in which Christensen placed Zhang's remains was emptied three days later and the contents taken to a private landfill in
Vermilion County, compacted at least twice, spread over an area fifty yards wide, and subsequently buried under thirty feet of garbage. Recovery of Zhang's remains would be difficult and a search for her remains has not begun. In October 2019, Christensen was transferred to
FTC Oklahoma City for evaluation and processing. In early December 2019, Christensen reported to
USP McCreary in Pine Knot, Kentucky to begin serving his life sentence. Christensen was transferred to
USP Coleman II in Florida in early 2020. ==Memorials==