Police have identified the student they believe is responsible for fatally stabbing a professor at the University of Southern California.
Los Angeles Police say 28-year-old David Jonathan Brown of Los Angeles was booked on a charge of murder in the death of Professor Bosco Tjan, a psychology professor and neuroscientist.
Brown is being held on $1 million bail. It wasn't clear if he has an attorney.He was arrested shortly after the stabbing.
Tjan was killed in the building that houses the lab he ran.
A David Brown is listed as a graduate student in psychology on USC's website. Tjan oversaw graduate students in the department.
Though details of the motive weren't released, Los Angeles Police Officer Meghan Aguilar says Tjan was specifically targeted and that the attack wasn't random.