CHAPEL HILL, N.C. • A University of North Carolina graduate student charged with killing his faculty adviser walked into a classroom building, shot the victim and then left, authorities said Tuesday, shedding light on an attack that led to a campuswide lockdown as police searched for the gunman.

Tailei Qi, 34, was charged Tuesday with first-degree murder and having a gun on educational property in Monday’s killing of Zijie Yan inside of a science building at the state’s flagship public university.

Chapel Hill city police arrested Qi in a residential neighborhood near the campus within two hours of the attack and didn’t need to use force to take him into custody, UNC Police Chief Brian Jones said at a news conference. He said investigators were still trying to determine a motive and were still searching for the gun used to kill Yan.

UNC Chancellor Kevin Guskiewicz said his team has met with Yan’s colleagues and family to express condolences and offer support.

“He was a beloved colleague, mentor and a friend of so many on our campus and a father to two young children,” Guskiewicz said at the news conference.

On Wednesday, the school’s iconic Bell Tower will ring in honor of Yan’s memory and students are encouraged to take a moment of silence, he said. The school also canceled classes until Thursday.

Earlier Tuesday, Qi made an initial appearance in Orange County Superior Court. During the brief hearing, Judge Sherri Murrell ordered Qi to remain jailed without bond as an interpreter explained to Qi in Mandarin what was happening. She scheduled his next court date for Sept. 18.

When the hearing ended, Qi bowed to his interpreter, his attorney and the guards before they took him away in handcuffs. Dana Graves, a public defender who represented Qi at the hearing, left the courtroom without talking to reporters.

Yan was an associate professor in the Department of Applied Physical Sciences who had worked for the university since 2019, UNC said in a statement Tuesday. He led the Yan Research Group, which Qi joined last year, according to the group’s UNC webpage. He earned his PhD in materials engineering from Rensselaer Polytechnic Institute in New York and previously worked as an assistant professor at Clarkson University.