A 40-year-old man who witnesses said stabbed and beheaded his seat mate aboard a Greyhound bus traveling across Canada made his first court appearance Friday on second degree murder charges. Police offered no motive for the savage attack against a man who friends described as an easygoing carnival worker. Vince Weiguang Li, of Edmonton, Alberta, his face bruised, one hand bandaged and his legs shackled, shuffled into a courtroom for a procedural hearing in Portage la Prairie, Manitoba, with his head bowed. He did not reply when the judge asked him if he was getting a lawyer, and only nodded slightly when asked whether he was exercising his right not to speak. He was not required to enter a plea. Second-degree murder charges are generally filed when authorities do not believe the crime was premeditated. The prosecutor asked for a psychiatric assessment, but the judge said he wanted to give Li a chance to meet with his lawyer about that. Li's next court appearance is scheduled for Tuesday. The Royal Canadian Mounted Police said Li has no known criminal record.