Student arrested in death of prof

los angeles» A graduate student arrested on suspicion of stabbing to death the professor who oversaw his work at the University of Southern California was being held on $1 million bail Saturday as their shocked colleagues began processing the stunning news.

David Jonathan Brown, a 28-year-old brain and cognitive science student, was arrested in connection with the Friday afternoon attack in the heart of the Los Angeles campus. His mentor, Bosco Tjan, was pronounced dead at the scene.

Brown was among just five students who worked in Tjan’s lab that studied vision loss. In a biography page about the students, Brown’s is the only one without a detailed description or photograph.

Tjan was killed inside the Seeley G. Mudd building where he was running the lab. Brown was arrested without incident almost immediately afterward, police said, adding that the killing was targeted.

Kilho Shin, also a brain and cognitive science graduate student who worked in Tjan’s lab, said Saturday that Brown was a quiet student and seemed satisfied with Tjan’s oversight.

“I don’t know what exactly happened between them. But as far as I know, Bosco likes David’s work and David also seemed to be satisfied with his supervising,” Shin said. “Their conversation on research was healthy and constructive.”