A schizophrenic man who beheaded and cannibalized a fellow Greyhound bus passenger will remain in a psychiatric hospital for at least another year.

Stanley Li was found not criminally responsible earlier this year for the July killing of Tim McLean, whom he stabbed dozens of times and dismembered as horrified passengers fled the bus.

Click here for photos from the crime scene.

A judge ruled that he suffered from untreated schizophrenia and did not realize that his actions were wrong.

The Manitoba Criminal Review Board ruled Thursday that Li remained too dangerous to be freed.

The board accepted the recommendations of Li's psychiatrist, who said Li is taking his medicine and no longer hears voices in his head, but still needs to be under the "highest level of security possible."

Li's case will be reviewed annually to determine if he is well enough to be released.

McLean's mother, Carol deDelley, was heartbroken with the ruling. She says there will always be a chance that he could suffer a relapse and she maintains he should be institutionalized for life.