TORONTO - A 40-year-old man who witnesses said stabbed and beheaded his seat mate on a Greyhound bus in Canada made his first court appearance Friday, while police offered no motive for the savage attack against the 22-year-old carnival worker. | Video

Vince Weiguang Li, of Edmonton, Alberta, has been charged with second-degree murder and walked into the courtroom Friday in Portage la Prairie, Manitoba with his head bowed.

He did not reply when the judge asked him if he was going to get a lawyer, and only nodded slightly when asked whether he was exercising his right not to speak.

The prosecutor asked for a psychiatric assessment, but the judge said he wanted to give Li a chance to meet with his lawyer. Li's next court appearance is scheduled for Tuesday.

Authorities have not released the victim's name but The Canadian Press said friends had identified him as Tim McLean and said he was headed to Winnipeg after working with the carnival in Edmonton.

William Caron, 23, said McLean was quiet, though he liked to socialize with friends. He was small - about 5-foot-4 and 130 pounds - and tended stayed away from a fight, Caron said.

"From what I hear, this other guy is three times his size," Caron said. "All the time I've known Tim, he's never been the type of guy to get into a fight with. He always kept to himself when there's strangers around."

Witnesses said the victim was stabbed dozens of times in the Wednesday night attack aboard the bus as it traveled a desolate stretch of the TransCanada Highway about 12 miles from Portage La Prairie, Manitoba.

They said the attacker then severed his seat mate's head, displayed it and then began cutting up the body.

Garnet Caton, who was sitting just one seat in front of them, said the suspect had been on the bus about an hour. He initially did not sit near the victim but changed seats after a rest stop. Caton said he did not hear the two speak to each other before the attack.

"We heard this bloodcurdling scream and turned around, and the guy was standing up, stabbing this guy repeatedly," Caton said.

Caton said the driver stopped the bus when he became aware of the attack and passengers raced off. A short while later, Caton said he re-boarded along with the bus driver and a trucker who had stopped to see what was happening.

He said the suspect had the victim on the floor of the bus and "was cutting his head off" with a large hunting knife.

"When he was attacking him, he was calm," said Caton. "There was no rage or anything. He was just like a robot stabbing the guy."

The attacker turned toward them and the three men quickly left the bus, blocking the door as the attacker slashed at them through an opening. Caton said the driver disabled the vehicle after the attacker tried to drive it away.

As the three guarded the door with a crow bar and a hammer, the attacker went back to the body and calmly came to the front of the bus to show off the head, Caton said.

Greyhound spokeswoman Abby Wambaugh said there had been 37 passengers aboard, many watching a movie when the violence erupted. She called the attack tragic but isolated.