A forensic psychiatrist says the teenaged girl responsible for goading her boyfriend into killing her perceived rival Stefanie Rengel could evolve into someone similar to a terrifying landmark 1980s movie character.

Dr. Philip Klassen told the second day of M.T.'s sentencing hearing that the 17-year-old continues to minimize her involvement in the New Year's Day stabbing death of Rengel.

He described the teen, convicted of first-degree murder, as being more self-pitying than remorseful.

Klassen even compared M.T., who can't be fully named due to provisions in the Youth Criminal Justice Act, to Glenn Close's character in the 1987 thriller "Fatal Attraction."

In that movie, Close played a woman who had a one-night affair with a married man and then began obsessively stalking him and his family.

If M.T. continues on the same path, she could become an adult with a "highly functioning" borderline personality organization such as the one portrayed by Close's character, he said, but added in his report that such an outcome is not a foregone conclusion.

The psychiatrist, in response to defence questions, said he couldn't predict how M.T. might respond to treatment or whether she would gain better control of her emotions as she moved into adulthood.

He interviewed M.T. for a total of five hours.

Her boyfriend D.B. is the person who actually stabbed Rengel, who was only 14. He left her to die in a snowbank just outside her home. He did so after M.T. said he wouldn't be able to have sex with her until Rengel was dead. She told a friend that she and D.B. had sex within hours of Rengel's murder.

D.B. pleaded guilty to first-degree murder and will be sentenced this fall.

With three of her boyfriends, M.T. showed evidence of anger, jealousy and manipulation, Klassen said, adding her relationships would have to be monitored.

Klassen said M.T. continues to wish harm on unspecified people who had said unflattering things about her, CTV Toronto's Chris Eby reported from outside the courthouse at 361 University Ave.

The key question for Justice Ian Nordheimer is whether to sentence M.T. as a young offender or adult.

The Crown wants her sentenced as an adult, which would mean a term of life in prison with no parole eligibility for five to seven years.

If he sentences her as a young offender, she would get a 10 year sentence. Six of those years would be served in closed custody and four more in the community under supervision.

With a report from CTV Toronto's Chris Eby and files from The Canadian Press