M.T., the teenager facing a possible adult sentence for first-degree murder, wants to address the court before lawyers make final arguments in her case.

This will happen on Friday.

Defence lawyer Marshall Sack made the request on Thursday, after three days of testimony and highly emotional victim impact statements.

Justice Ian Nordheimer allowed the request, but in return, M.T. will not be able to address the court at a later time.

She chose not to testify during the trial, which is the right of any defendant.

A jury found M.T., who can't be fully named due to provisions in the Youth Criminal Justice Act, guilty in March in the death of Stefanie Rengel, a teen M.T. had never met.

M.T.'s boyfriend D.B. actually killed Rengel by stabbing her six times and leaving her to die in a snowbank outside her home on New Year's Day 2008.

He acted following months of pressure from M.T., who denied him any sexual activity unless he killed Rengel.

D.B. has pleaded guilty and will be sentenced this fall.

On Tuesday, Dr. Philip Klassen, a forensic psychiatrist, testified that M.T. could develop into an adult with a "highly functioning" borderline personality organization.

In popular culture, the character that comes closest to such a diagnosis is Glenn Close's character in the 1987 film "Fatal Attraction." However, he conceded that such an outcome is far from a certainty.

A psychiatrist commissioned by the defence testified Wednesday that M.T. has a body image disorder that leaves her desperately insecure over her relationships.

Dr. Julian Gojer disagreed with the "Fatal Attraction" analogy. He didn't think M.T. showed enough characteristics to merit the label.

Under cross-examination, the psychiatrist did agree that M.T.'s description of her role in the murder was much milder compared to what she told the police in an interview conducted mere hours after the murder.

When Nordheimer passes sentence, he will have to determine how much of a future risk M.T. might pose to the public.

If he sentences her as a young offender, she will face a maximum 10-year sentence, with six years in closed custody and four years in open custody.

If she is sentenced as an adult, M.T. will receive a life sentence with no parole eligibility for five to seven years. Once she is paroled, she would be under the supervision of the courts for the rest of her life.

As an adult, M.T.'s identity could also be made public.

With files from The Canadian Press