Tim McLean's mother, Carol deDelley, will join Charles Adler tonight at 8PM ET/9PM MT.

WINNIPEG - "Forgiveness is the 'F' word in victims' circles because it's usually asked by people who have never had to forgive anything of this magnitude."

That's what Tim McLean's mother, Carol deDelley thinks of forgiving her son's killer, Vince Li.

She was reacting to an interview Li gave Chris Summerville, CEO of the Schizophrenia Society of Canada, earlier this month.

In the interview, Li says he wished to apologize to McLean's family, and thinks the RCMP should have killed him that night on the Greyhound bus.

RELATED: An interview with Vince Li

A recent annual review of Li's case granted him more freedom to walk around the Selkirk Mental Health facility where he's been detained the past four years.

In the interview, Li says he is feeling better, that his thoughts are not weird anymore and that he takes his medication.

That's little comfort to deDelley.

"He can be managed, he can be controlled. And that's with constant tweaking of his medication in a controlled environment. He doesn't have the stresses of everyday life that everyone else has, about paying your bills, making your mortgage payment, keeping a job." deDelley says, fearing what happens if he's released.

"What assurances do we have that he would take his medication when he's out. His word? The word of a psychiatrist?"

The interview with Li touched on Tim's law, being pushed for by deDelley, that would see killers found not to be criminally insane kept behind bars.

"If individuals like Vince Li are not responsible for their own actions, and behaviour and subsequent crimes, then the state needs to assume responsibility. And when the state cannot guarantee you that he won't do it again, never let them free." deDelley said.

Dr. Steven Kremer, who spoke to the review board, said Li had a 0.8% chance of re-offending, not low enough for McLean's mom.

"I don't think that they (psychiatrists) can give us any guarantees."

Who would be responsible if he were to re-offend? It won't be the man from the Schizophrenia society, it won't be the psychiatrists, it won't be the review board. It won't be Vince Li," deDelley said.

-- with files from Mark Bonokoski