It was June, 2010, Grand Prix weekend in downtown Montreal, and on two straight nights the 19-year-old stayed out past dawn against her parents’ wishes.

For her mother, Johra Kaleki, the behaviour confirmed that all her efforts to steer her eldest daughter on the right path had failed. “I felt like she would never be fixed,” she told Sgt.-Det. Alexandre Bertrand in an interrogation video played Wednesday in Quebec Court.

As her crying husband spoke to Bahar in the basement of their Dorval home, Ms. Kaleki went upstairs and grabbed a large knife from the kitchen counter, the one she used to chop meat, she recounted. “I said, ‘This is the time.’ ”

She hid the knife under her T-shirt, returned to the basement, and told her husband the problem would best be resolved between mother and daughter. “Just leave us alone for five minutes,” she said she told him. “Don’t come until I call you.”

He left and she cuddled her first-born and told her to lie on her stomach so she could give her a back massage. “Then I stab her, stab her neck,” she confessed. “She said, ‘No Mom!’ I said, ‘It’s for your good. Let me finish.’ ”