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In his close to 20 years working with adolescents in the criminal justice system, Dr. Brent Harold has met with approximately 5,600 patients.

Of those, he views just four — maybe five — as meeting the definition of a psychopath.

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The 19-year-old man awaiting sentence for the Jan. 12, 2015, murder of teenager Hannah Leflar is among them.

Leflar was just 16 when her then-16-year-old ex-boyfriend armed himself with a buck knife and entered her Regina home, stabbing and slashing her to death.

An agreed statement of facts outlined a troubling history that began when Leflar ended the relationship in May 2014, a break-up the male did not take well. The youth decided to kill Leflar when he saw photos of her with her new boyfriend.

Harold said he first saw the youth in the summer of 2015, responding to a concern the teen was depressed. It was at one of the first visits the youth told the psychiatrist he believed he had been suffering from schizophrenia at the time of the killing, saying voices in his head had urged him to do it — a claim Harold discounted when the youth didn’t present any other symptoms needed for such a diagnosis.