Updated

A man who beheaded and cannibalized a fellow passenger on a Greyhound bus in Canada won his bid to leave the grounds of the mental hospital where he is being kept, a criminal review board ruled Thursday.

The Criminal Code review board said Vince Li's treatment team may grant him short escorted trips into the central Canadian city of Selkirk, Manitoba.

The review board said the passes will start at 30 minutes and increase incrementally to a maximum of full days.

Li was found not criminally responsible for the July 2008 death of Tim McLean, a young carnival worker who was sitting next to Li on a bus near Portage la Prairie.

The board said the passes should only be granted if Li's treatment team believes his condition is stable and that it would be "appropriate and safe for him to leave the locked ward."

Li will have to be escorted at all times by a staff member and a security officer.

"It's terrible. It's disgusting," Nadine McLean, the victim's stepmother, said Thursday after she learned about the decision. "It's kind of a waste going to the review board every year when he's going to get whatever he asks for."

The passes can be issued starting May 24.

Li was initially confined to a locked wing of the Selkirk Mental Health Centre, but in 2010 was given the right to escorted walks on the hospital grounds.

Li's psychiatrist said the 44-year-old has responded well to treatment and asked the review board earlier this week to let Li take trips into town.

McLean had his eyes closed and was listening to music on his headphones when Li, a stranger who was sitting beside him, suddenly stood up and started stabbing him. As the bus stopped and horrified passengers fled, Li carved up McLean's body and ate portions of it.

Li's trial was told he was an untreated schizophrenic.

As part of this year's review, Li's psychiatrist, Dr. Steven Kremer, described Li as a model patient, who has shown no security risks and who has participated in treatment programs and taken up odd jobs at the hospital.

Li emigrated from China in 2001 and worked menial jobs in Canada.