David Jonathan Brown pled not guilty by reason of insanity in the murder of professor Bosco Tjan on Wednesday. He also reaffirmed his not guilty plea in the use of a knife in Tjans death.

Browns mental state will be evaluated by Risa Grand, a forensic psychiatrist for the Los Angeles County Superior Court and former assistant clinical professor at USC.

Brown, a graduate neuroscience student, is charged with first-degree murder, including a special allegation of using a deadly and dangerous weapon to kill Tjan.

If Brown is found not guilty by reason of insanity, he could be sentenced to life in a state mental health institution, according to Deputy District Attorney Beth Silverman. If he is found guilty of first-degree murder, he could serve from 25 years to life in prison. If Brown is found guilty of second-degree murder, he could serve a lower sentence of 15 years to life in prison.

Brown was arrested at the scene of the crime in December, and police said Tjans murder was driven by a personal dispute. He worked in Tjans lab and had taken a leave of absence for personal reasons last year, according to the New York Daily News.

Browns next preliminary hearing is scheduled for June 21.

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Student enters insanity plea in killing of neuroscience professor - Daily Trojan Online