03/20/2012 04:30 EDT | Updated 05/19/2012 05:12 EDT

Psychologist to testify at trial of woman accused of drowning her young sons

WETASKIWIN, Alta. - A psychologist from Alberta Hospital who has been treating Allyson McConnell is scheduled to take the stand today in her second-degree murder trial.

McConnell has admitted to holding her two young sons under water in the bathtub until they drowned, but has pleaded not guilty to the charges.

The woman from Millet, Alta., has testified she remembers starting to drink and take pills, and has vague memories of throwing herself off a bridge onto a busy freeway that same day.

But she has testified she doesn't remember killing them and believed that 2 1/2-year-old Connor and 10-month-old Jayden were still alive days after they were already dead.

It wasn't until her mother and sister told her as she recuperated in hospital that she realized what she'd done.

Court has been told McConnell has a long history of mental-health problems, and she has testified her father impregnated her when she was a teenager, though she miscarried.