"The man accused of stabbing and decapitating a fellow passenger aboard a Greyhound bus will face trial on Tuesday, and lawyers from both sides are expected to focus on whether he was insane at the time of the attack.
Vince Li, 40, is charged with second-degree murder. His lawyers are not disputing that he killed 22-year-old Tim McLean. Instead, they will likely question whether Li should be found criminally responsible.
If the judge agrees that Li was insane at the time of the attack, and not criminally responsible, Li could be released or hospitalized indefinitely.
That possibility has upset McLean's mother, Carol DeDelley. She wants politicians to pass "Tim's Law," which would mean anyone convicted of murder would be incarcerated for life, with no chance of parole.
"I believe there should be treatment and punishment," she said.
But Prof. Arthur Schafer, director of the Centre for Professional and Applied Ethics at the University of Manitoba, said it would be morally irresponsible to change the current law.
He said the justice system must distinguish between someone who is aware they have committed a crime, and someone who is not in control of his or her actions.
"There is a fundamental distinction between being morally and criminally responsible because you know what you're doing, and being insane, where you don't know what you are doing," he said.
"That's the basis of our criminal justice system and we can't abolish it."