Yingying Zhang was a visiting scholar in the United States from China, who has not been seen since she entered a car at a bus stop on the University of Illinois at Urbana–Champaign campus on June 9, 2017. On June 30, 2017, the FBI arrested and charged Brendt Christensen, a Champaign resident and former physics graduate student at the university, with kidnapping Zhang. Based on evidence uncovered during the investigation, law enforcement officials said they believed Zhang was no longer alive. On June 24, 2019, Christensen was convicted of Zhang's murder.